diff --git a/src/pages/DemandNote/Create/SearchForm.js b/src/pages/DemandNote/Create/SearchForm.js
index 796b181..140e93f 100644
--- a/src/pages/DemandNote/Create/SearchForm.js
+++ b/src/pages/DemandNote/Create/SearchForm.js
@@ -13,7 +13,7 @@ import * as DateUtils from "utils/DateUtils";
 import * as UrlUtils from "utils/ApiPathConst";
 import * as HttpUtils from "utils/HttpUtils";
 import { useNavigate } from "react-router-dom";
-import { notifyDownloadSuccess } from 'utils/CommonFunction';
+import { notifyActionError } from 'utils/CommonFunction';
 import { PNSPS_BUTTON_THEME } from "../../../themes/buttonConst";
 import { ThemeProvider } from "@emotion/react";
 import { useIntl } from "react-intl";
@@ -118,8 +118,11 @@ const SearchPublicNoticeForm = ({ applySearch, issueComboData, _paymentCount, _p
             params: {
                 "dnIdList": dnIdList
             },
-            onSuccess: function () {
-                notifyDownloadSuccess();
+            onResponse: function () {
+                // 200: browser handles save; no success toast
+            },
+            onError: function () {
+                notifyActionError(intl.formatMessage({ id: 'downloadFailed' }));
             }
         });
     }
diff --git a/src/pages/DemandNote/Details/ApplicationDetailCard.js b/src/pages/DemandNote/Details/ApplicationDetailCard.js
index f71362d..9af9945 100644
--- a/src/pages/DemandNote/Details/ApplicationDetailCard.js
+++ b/src/pages/DemandNote/Details/ApplicationDetailCard.js
@@ -15,11 +15,12 @@ import * as StatusUtils from "utils/statusUtils/PublicNoteStatusUtils";
 import * as HttpUtils from "utils/HttpUtils";
 
 import DownloadIcon from '@mui/icons-material/Download';
-import { notifyDownloadSuccess } from 'utils/CommonFunction';
+import { notifyActionError } from 'utils/CommonFunction';
+import { useIntl } from 'react-intl';
 
 // ==============================|| DASHBOARD - DEFAULT ||============================== //
 const ApplicationDetailCard = ({ data }) => {
-
+    const intl = useIntl();
     const [appDetail, setAppDetails] = React.useState({});
 
     React.useEffect(() => {
@@ -33,8 +34,11 @@ const ApplicationDetailCard = ({ data }) => {
             fileId: appDetail.appFileId,
             skey: appDetail.appSkey,
             filename: appDetail.appFilename,
+            onResponse: function () {},
+            onError: function () {
+                notifyActionError(intl.formatMessage({ id: 'downloadFailed' }));
+            }
         });
-        notifyDownloadSuccess();
     };
 
     return (
diff --git a/src/pages/DemandNote/Details/DnDetailCard.js b/src/pages/DemandNote/Details/DnDetailCard.js
index e60f200..ee79a77 100644
--- a/src/pages/DemandNote/Details/DnDetailCard.js
+++ b/src/pages/DemandNote/Details/DnDetailCard.js
@@ -14,12 +14,13 @@ import Loadable from 'components/Loadable';
 const MainCard = Loadable(React.lazy(() => import('components/MainCard')));
 
 import DownloadIcon from '@mui/icons-material/Download';
-import { notifyDownloadSuccess } from 'utils/CommonFunction';
+import { notifyActionError } from 'utils/CommonFunction';
+import { useIntl } from 'react-intl';
 
 
 // ==============================|| DASHBOARD - DEFAULT ||============================== //
 const DnDetailCard = ({ data }) => {
-
+    const intl = useIntl();
     const [dnData, setDnData] = React.useState({});
 
     React.useEffect(() => {
@@ -33,8 +34,9 @@ const DnDetailCard = ({ data }) => {
             fileId: dnData.fileId,
             skey: dnData.skey,
             filename: dnData.filename,
-            onResponse: function () {
-                notifyDownloadSuccess();
+            onResponse: function () {},
+            onError: function () {
+                notifyActionError(intl.formatMessage({ id: 'downloadFailed' }));
             }
         });
     };
diff --git a/src/pages/DemandNote/Search/DataGrid.js b/src/pages/DemandNote/Search/DataGrid.js
index fc2afda..8e2a88e 100644
--- a/src/pages/DemandNote/Search/DataGrid.js
+++ b/src/pages/DemandNote/Search/DataGrid.js
@@ -13,7 +13,7 @@ import * as FormatUtils from "utils/FormatUtils";
 import * as StatusUtils from "utils/statusUtils/DnStatus";
 import { useNavigate } from "react-router-dom";
 import { FiDataGrid } from "components/FiDataGrid";
-import { notifyDownloadSuccess } from 'utils/CommonFunction';
+import { notifyActionError } from 'utils/CommonFunction';
 import {
     DEMAND_NOTE_EXPORT,
     DEMAND_NOTE_SEND,
@@ -26,10 +26,11 @@ import * as HttpUtils from "utils/HttpUtils";
 import { PNSPS_BUTTON_THEME } from "themes/buttonConst";
 import { ThemeProvider } from "@emotion/react";
 import { isGrantedAny } from "auth/utils";
+import { useIntl } from "react-intl";
 // ==============================|| EVENT TABLE ||============================== //
 
 export default function SearchDemandNote({ applySearch, searchCriteria, applyGridOnReady }) {
-
+    const intl = useIntl();
     const [isConfirmPopUp, setConfirmPopUp] = useState(false);
     const [isRevokePopUp, setRevokePopUp] = useState(false);
     const [isSendPopUp, setSendPopUp] = useState(false);
@@ -80,8 +81,9 @@ export default function SearchDemandNote({ applySearch, searchCriteria, applyGri
             params: {
                 dnIdList: idList
             },
-            onSuccess: function () {
-                notifyDownloadSuccess();
+            onResponse: function () {},
+            onError: function () {
+                notifyActionError(intl.formatMessage({ id: 'downloadFailed' }));
             }
         });
     }
@@ -92,11 +94,12 @@ export default function SearchDemandNote({ applySearch, searchCriteria, applyGri
             fileId: params.row.fileId,
             skey: params.row.skey,
             filename: params.row.filename,
-            onResponse:()=>{
-                setOnDownload(false)
+            onResponse: () => {
+                setOnDownload(false);
             },
-            onError:()=>{
-                setOnDownload(false)
+            onError: () => {
+                setOnDownload(false);
+                notifyActionError(intl.formatMessage({ id: 'downloadFailed' }));
             }
         });
     };
diff --git a/src/pages/Proof/Create_FromApp/ProofForm.js b/src/pages/Proof/Create_FromApp/ProofForm.js
index d9f1d2c..b67bdc8 100644
--- a/src/pages/Proof/Create_FromApp/ProofForm.js
+++ b/src/pages/Proof/Create_FromApp/ProofForm.js
@@ -170,8 +170,8 @@ const FormPanel = ({ formData }) => {
                             msg = "Action Failed: There is already a pending payment and proofreading record for client review."
                         } else if (msg === "haveProofed") {
                             msg = "Action Failed: An active proof is already created for this application."
-                        } else if (msg === "applicationNotFound") {
-                            msg = "Application not found."
+                        } else {
+                            msg = intl.formatMessage({ id: msg });
                         }
                         setWarningText(msg);
                         setIsWarningPopUp(true);
diff --git a/src/pages/Proof/Reply_GLD/ApplicationDetails.js b/src/pages/Proof/Reply_GLD/ApplicationDetails.js
index f3c1f51..c241b75 100644
--- a/src/pages/Proof/Reply_GLD/ApplicationDetails.js
+++ b/src/pages/Proof/Reply_GLD/ApplicationDetails.js
@@ -11,6 +11,7 @@ import {
 } from '@mui/material';
 
 import { useFormik } from 'formik';
+import { useIntl } from 'react-intl';
 import {isGranted} from "auth/utils";
 import {useState,useEffect,lazy} from "react";
 import * as HttpUtils from "utils/HttpUtils"
@@ -31,10 +32,13 @@ const ApplicationDetailCard = ({
 }) => {
 
     const params = useParams();
+    const intl = useIntl();
 
     const [data, setData] = useState({});
     const [cancelPopUp, setCancelPopUp] = useState(false);
     const [onDownload, setOnDownload] = useState(false);
+    const [alertMsg, setAlertMsg] = useState('');
+    const [showAlert, setShowAlert] = useState(false);
 
     useEffect(() => {
         if (formData) {
@@ -97,8 +101,14 @@ const ApplicationDetailCard = ({
         setCancelPopUp(false);
         HttpUtils.get({
             url: UrlUtils.CANCEL_PROOF + "/" + params.id,
-            onSuccess: function () {
-                window.location.reload(false);
+            onSuccess: function (responseData) {
+                if (responseData && responseData.success === false) {
+                    const msg = responseData.msg ? intl.formatMessage({ id: responseData.msg }) : intl.formatMessage({ id: 'proofAlreadyCancelled' });
+                    setAlertMsg(msg);
+                    setShowAlert(true);
+                } else {
+                    window.location.reload(false);
+                }
             }
         });
     }
@@ -189,7 +199,7 @@ const ApplicationDetailCard = ({
 
                                     <Grid item xs={12} md={9} lg={9} sx={{ display: 'flex', alignItems: 'center' }}>
                                         <FormControl variant="outlined">
-                                            {StatusUtils.getStatusByText(data.appStatus)}
+                                            {StatusUtils.getStatusByTextEng(data.appStatus, data.creditor)}
                                         </FormControl>
                                     </Grid>
                                 </Grid>
@@ -349,6 +359,15 @@ const ApplicationDetailCard = ({
                             <Button onClick={() => confirmCancel()}><Typography variant="h5">Confirm</Typography></Button>
                         </DialogActions>
                     </Dialog>
+                    <Dialog open={showAlert} onClose={() => setShowAlert(false)}>
+                        <DialogTitle><Typography variant="h3">{intl.formatMessage({ id: 'attention' })}</Typography></DialogTitle>
+                        <DialogContent>
+                            <Typography variant="h4" style={{ padding: '16px' }}>{alertMsg}</Typography>
+                        </DialogContent>
+                        <DialogActions>
+                            <Button onClick={() => setShowAlert(false)}><Typography variant="h5">OK</Typography></Button>
+                        </DialogActions>
+                    </Dialog>
                 </div>
             </form>
         </MainCard>
diff --git a/src/pages/Proof/Reply_Public/ProofForm.js b/src/pages/Proof/Reply_Public/ProofForm.js
index 2d9511c..b52bf77 100644
--- a/src/pages/Proof/Reply_Public/ProofForm.js
+++ b/src/pages/Proof/Reply_Public/ProofForm.js
@@ -166,14 +166,16 @@ const FormPanel = ({ formData }) => {
                 onFail: function (response) {
                     setIsSubmitting(false);
                     setWarningTitle(intl.formatMessage({ id: "attention" }))
-                    setWarningText(intl.formatMessage({ id: 'actionFail' }));
+                    const msg = response?.data?.msg ? intl.formatMessage({ id: response.data.msg }) : intl.formatMessage({ id: 'actionFail' });
+                    setWarningText(msg);
                     setIsWarningPopUp(true);
                     console.log(response);
                 },
                 onError: function (error) {
                     setIsSubmitting(false);
                     setWarningTitle(intl.formatMessage({ id: "attention" }))
-                    setWarningText(intl.formatMessage({ id: 'actionFail' }));
+                    const msg = error?.response?.data?.msg ? intl.formatMessage({ id: error.response.data.msg }) : intl.formatMessage({ id: 'actionFail' });
+                    setWarningText(msg);
                     setIsWarningPopUp(true);
                     console.log(error);
                 }
diff --git a/src/pages/PublicNotice/Details_GLD/ApplicationDetailCard.js b/src/pages/PublicNotice/Details_GLD/ApplicationDetailCard.js
index 931ec83..d831392 100644
--- a/src/pages/PublicNotice/Details_GLD/ApplicationDetailCard.js
+++ b/src/pages/PublicNotice/Details_GLD/ApplicationDetailCard.js
@@ -33,9 +33,9 @@ import CloseIcon from '@mui/icons-material/Close';
 import EditNoteIcon from '@mui/icons-material/EditNote';
 import DownloadIcon from '@mui/icons-material/Download';
 import ReplayIcon from '@mui/icons-material/Replay';
-import { notifyDownloadSuccess } from 'utils/CommonFunction';
+import { notifyActionError } from 'utils/CommonFunction';
 import { isGrantedAny } from "auth/utils";
-// import { useIntl } from "react-intl";
+import { useIntl } from "react-intl";
 
 // ==============================|| DASHBOARD - DEFAULT ||============================== //
 const ApplicationDetailCard = (
@@ -59,13 +59,15 @@ const ApplicationDetailCard = (
     const [mode, setMode] = useState("");
 
     const { register, handleSubmit } = useForm()
-    // const intl = useIntl();
+    const intl = useIntl();
 
     const [isWarningPopUp, setIsWarningPopUp] = useState(false);
     const [warningText, setWarningText] = useState("");
 
     const [remarksPopUp, setRemarksPopUp] = useState(false);
     const [onDownload, setOnDownload] = useState(false);
+    // eslint-disable-next-line no-unused-vars -- isProofCheckLoading in onProofClick + Button disabled; setIsProofCheckLoading in onProofClick callbacks
+    const [isProofCheckLoading, setIsProofCheckLoading] = useState(false);
 
     useEffect(() => {
         //if user data from parent are not null
@@ -125,12 +127,12 @@ const ApplicationDetailCard = (
             fileId: fileDetail?.id,
             skey: fileDetail?.skey,
             filename: fileDetail?.filename,
-            onResponse:()=>{
-                setOnDownload(false)
-                notifyDownloadSuccess()
+            onResponse: () => {
+                setOnDownload(false);
             },
-            onError:()=>{
-                setOnDownload(false)
+            onError: () => {
+                setOnDownload(false);
+                notifyActionError(intl.formatMessage({ id: 'downloadFailed' }));
             }
         });
         setUploadStatus(true)
@@ -178,10 +180,13 @@ const ApplicationDetailCard = (
     };
 
     const onProofClick = () => {
+        if (isProofCheckLoading) return;
         if (applicationDetailData.data.groupNo) {
+            setIsProofCheckLoading(true);
             HttpUtils.get({
                 url: CHECK_CREATE_PROOF + "/" + currentApplicationDetailData.id,
                 onSuccess: function (responeData) {
+                    setIsProofCheckLoading(false);
                     if (responeData.success == true) {
                         window.open("/proof/create/" + currentApplicationDetailData.id, "_blank", "noreferrer");
                         window.addEventListener("focus", onFocus)
@@ -191,13 +196,15 @@ const ApplicationDetailCard = (
                             msg = "Action Failed: There is already a pending payment and proofreading record for client review."
                         } else if (msg === "haveProofed") {
                             msg = "Action Failed: An active proof is already created for this application."
-                        } else if (msg === "applicationNotFound") {
-                            msg = "Application not found."
+                        } else {
+                            msg = intl.formatMessage({ id: msg });
                         }
                         setWarningText(msg);
                         setIsWarningPopUp(true);
                     }
-                }
+                },
+                onFail: () => setIsProofCheckLoading(false),
+                onError: () => setIsProofCheckLoading(false)
             });
         } else {
             setWarningText("Please generate Gazette Code before Create Proof.");
@@ -258,6 +265,7 @@ const ApplicationDetailCard = (
                                                 <Button
                                                     // size="large"
                                                     variant="contained"
+                                                    disabled={isProofCheckLoading}
                                                     onClick={() => { onProofClick() }}
                                                     sx={{
                                                         textTransform: 'capitalize',
diff --git a/src/pages/Setting/DrImport/index.js b/src/pages/Setting/DrImport/index.js
index 80968e0..2aeb659 100644
--- a/src/pages/Setting/DrImport/index.js
+++ b/src/pages/Setting/DrImport/index.js
@@ -9,7 +9,7 @@ import {
     Stack, Box,
     Dialog, DialogTitle, DialogContent, DialogActions,
 } from '@mui/material';
-import { notifyDownloadSuccess } from 'utils/CommonFunction';
+import { notifyActionError } from 'utils/CommonFunction';
 
 import { FormattedMessage, useIntl } from "react-intl";
 
@@ -135,8 +135,9 @@ const Index = () => {
                             onClick={()=>{
                                 HttpUtils.fileDownload({
                                     url: UrlUtils.DR_EXPORT,
-                                    onSuccess: ()=>{
-                                        notifyDownloadSuccess();
+                                    onResponse: () => {},
+                                    onError: () => {
+                                        notifyActionError(intl.formatMessage({ id: 'downloadFailed' }));
                                     }
                                 });
                             }}
diff --git a/src/pages/authentication/auth-forms/BusCustomFormWizard.js b/src/pages/authentication/auth-forms/BusCustomFormWizard.js
index ed221ac..e6c4934 100644
--- a/src/pages/authentication/auth-forms/BusCustomFormWizard.js
+++ b/src/pages/authentication/auth-forms/BusCustomFormWizard.js
@@ -100,6 +100,7 @@ const BusCustomFormWizard = (props) => {
     const [termsAndConNotAccept, setTermsAndConNotAccept] = useState(false);
     const [isValid, setisValid] = useState(false);
     const [checkCountry, setCheckCountry] = useState(false);
+    // eslint-disable-next-line no-unused-vars -- used as ref for hidden file input (ref={fileInputRef}) and in click handlers
     const fileInputRef = useRef(null);
     const username = document.getElementById("username-login")
     const [checkUsername, setCheckUsername] = useState(false);
diff --git a/src/pages/authentication/auth-forms/CustomFormWizard.js b/src/pages/authentication/auth-forms/CustomFormWizard.js
index 5085655..b169262 100644
--- a/src/pages/authentication/auth-forms/CustomFormWizard.js
+++ b/src/pages/authentication/auth-forms/CustomFormWizard.js
@@ -101,6 +101,7 @@ const CustomFormWizard = (props) => {
     const [termsAndConNotAccept, setTermsAndConNotAccept] = useState(false);
     const [isValid, setisValid] = useState(false);
     const [checkCountry, setCheckCountry] = useState(false);
+    // eslint-disable-next-line no-unused-vars -- used as ref for hidden file input (ref={fileInputRef}) and in click handlers
     const fileInputRef = useRef(null);
     
     const username = document.getElementById("username-login")
diff --git a/src/translations/en.json b/src/translations/en.json
index b1549a3..4a56dc6 100644
--- a/src/translations/en.json
+++ b/src/translations/en.json
@@ -97,6 +97,10 @@
   "MSG.plzSelectPaymentMethod": "Please select payment methods",
   "MSG.plzSelectApp": "Please select application",
   "MSG.actionFail": "Action failed",
+  "applicationNotFound": "Application not found.",
+  "applicationStatusChanged": "The application status has changed. Please refresh and try again.",
+  "proofStatusChanged": "The proof status has changed. Please refresh and try again.",
+  "proofAlreadyCancelled": "This proof has already been cancelled. Please refresh and try again.",
   "MSG.paymentHolded": "Payment for Application Number {appNo} is being processed. In case of unsuccessful payment, please try again after 30 minutes. We apologise for any inconvenience caused.",
   "MSG.pay_credity1": "We have received your confirmed application for proofreading and printing instructions regarding application number {appNo}. We will arrange for its publication with in the Year {year},  Volume {issueVolume}, Issue {issueNo} of the Gazette.",
   "MSG.pay_credity2": "A General Demand Note will be issued to you 14 calendar days after the publication of the public notice in the Gazette.  Please follow the payment instructions on the Demand Note and settle the payment promptly.",
@@ -625,6 +629,7 @@
   "captchaAudioServerError": "Audio CAPTCHA is temporarily unavailable. Please refresh the CAPTCHA.",
   "captchaExpired": "CAPTCHA expired. Please refresh and try again.",
   "connectionError": "Connection error. Please try again.",
+  "downloadFailed": "Download failed. Please try again.",
 
   "muiClear": "Clear",
   "muiClose": "Close", 
diff --git a/src/translations/zh-CN.json b/src/translations/zh-CN.json
index 8ab2085..df92bfb 100644
--- a/src/translations/zh-CN.json
+++ b/src/translations/zh-CN.json
@@ -133,6 +133,10 @@
   "MSG.plzSelectPaymentMethod": "请选择付款方式",
   "MSG.plzSelectApp": "请选择公共启事。",
   "MSG.actionFail": "行动失败",
+  "applicationNotFound": "找不到该申请。",
+  "applicationStatusChanged": "申请状态已变更。请刷新后再试。",
+  "proofStatusChanged": "校对状态已变更。请刷新后再试。",
+  "proofAlreadyCancelled": "此校对已取消。请刷新后再试。",
   "MSG.paymentHolded": "申请编号 {appNo}的付款正在处理中，如相关付款未能成功，请于30分钟后再尝试付款，不便之处，敬请原谅。",
   "MSG.pay_credity1": "我们已收到申请编号{appNo}的稿件校对确认及可付印指示，并将安排刊登于宪报期数{year} 年{issueVolume} 卷第{issueNo } 期内。",
   "MSG.pay_credity2": "宪报刊登后第十四个历日，发出「一般缴款单」通知缴款。请按照缴款单上的指示，依时缴费。",
@@ -621,6 +625,7 @@
   "captchaAudioServerError": "语音验证码暂时不可用，请刷新验证码。",
   "captchaExpired": "验证码已过期，请刷新后再试。",
   "connectionError": "连接错误，请稍后再试。",
+  "downloadFailed": "下载失败，请稍后再试。",
 
   "muiClear": "清除", 
   "muiClose": "关闭", 
diff --git a/src/translations/zh-HK.json b/src/translations/zh-HK.json
index e835e98..40681c3 100644
--- a/src/translations/zh-HK.json
+++ b/src/translations/zh-HK.json
@@ -133,6 +133,10 @@
   "MSG.plzSelectApp": "請選擇公共啟事。",
   "MSG.plzSelectPaymentMethod": "請選擇付款方式",
   "MSG.actionFail": "行動失敗",
+  "applicationNotFound": "找不到該申請。",
+  "applicationStatusChanged": "申請狀態已變更。請重新整理後再試。",
+  "proofStatusChanged": "校對狀態已變更。請重新整理後再試。",
+  "proofAlreadyCancelled": "此校對已取消。請重新整理後再試。",
   "MSG.paymentHolded": "申請編號 {appNo}的付款正在處理中，如相關付款未能成功，請於30分鐘後再嘗試付款，不便之處，敬請原諒。",
   "MSG.pay_credity1": "我們已收到申請編號{appNo}的稿件校對確認及可付印指示，並將安排刊登於憲報 期數 {year} 年 {issueVolume} 卷 第 {issueNo} 期內。",
   "MSG.pay_credity2": "此公共啟事申請的費用將於憲報刊登後第十四個曆日，發出「一般繳款單」通知繳款。請按照繳款單上的指示，依時繳費。",
@@ -622,6 +626,7 @@
   "captchaAudioServerError": "語音驗證碼暫時無法使用，請重新整理驗證碼。",
   "captchaExpired": "驗證碼已過期，請重新整理並再試。",
   "connectionError": "連線錯誤，請稍後再試。",
+  "downloadFailed": "下載失敗，請稍後再試。",
 
   "muiClear": "清除", 
   "muiClose": "關閉",