Can't upload files in copyedited stage and keep loading

Dear Team and Members,
I’m using OJS 3.3.0.8. I have tried to upload files in copyedited stage but I could not upload any files at copyedited phases.

Below is a screenshot for the error:

OJS2222

Your Help is highly appreciated,
Thanks in advance,
Regards,
-SALAM
The error message:

**[22-Mar-2022 00:02:40 Asia/Baghdad] PHP Warning:  htmlspecialchars() expects parameter 1 to be string, array given in /home2/*********/public_html/plugins/generic/googleScholar/GoogleScholarPlugin.inc.php on line 97**
**[22-Mar-2022 00:04:54 Asia/Baghdad] ojs2: 404 Not Found**
**[22-Mar-2022 00:33:40 Asia/Baghdad] PHP Warning:  Declaration of ManageCopyeditFilesForm::execute($stageSubmissionFiles, $fileStage = NULL) should be compatible with ManageSubmissionFilesForm::execute($stageSubmissionFiles = NULL, $fileStage = NULL, ...$functionArgs) in /home2/*************/public_html/lib/pkp/controllers/grid/files/copyedit/form/ManageCopyeditFilesForm.inc.php on line 18**
**[22-Mar-2022 00:33:41 Asia/Baghdad] PHP Fatal error:  Uncaught Error: Call to a member function getAssocId() on null in /home2/***************/public_html/lib/pkp/controllers/grid/files/SubmissionFilesCategoryGridDataProvider.inc.php:131**
**Stack trace:**
**#0 /home2/****************/public_html/lib/pkp/classes/controllers/grid/CategoryGridHandler.inc.php(402): SubmissionFilesCategoryGridDataProvider->loadCategoryData(Object(Request), 4, Array)**
**#1 /home2/*******/public_html/lib/pkp/classes/controllers/grid/CategoryGridHandler.inc.php(124): CategoryGridHandler->loadCategoryData(Object(Request), 4, Array)**
**#2 /home2/********************/public_html/lib/pkp/classes/controllers/grid/CategoryGridHandler.inc.php(473): CategoryGridHandler->getGridCategoryDataElements(Object(Request), 4)**
**#3 /home2/**************/public_html/lib/pkp/classes/controllers/grid/CategoryGridHandler.inc.php(453): CategoryGridHandler->_renderCategoryInternally(Object(Request), Object(SelectableSubmissionFileListCategoryGridRow))**
**#4 /home2/***********/public_html/lib/pkp/classes/controllers in /home2/*****************/public_html/lib/pkp/controllers/grid/files/SubmissionFilesCategoryGridDataProvider.inc.php on line 131**
**[22-Mar-2022 00:34:12 Asia/Baghdad] PHP Warning:  Declaration of ManageCopyeditFilesForm::execute($stageSubmissionFiles, $fileStage = NULL) should be compatible with ManageSubmissionFilesForm::execute($stageSubmissionFiles = NULL, $fileStage = NULL, ...$functionArgs) in /home2/*****************/public_html/lib/pkp/controllers/grid/files/copyedit/form/ManageCopyeditFilesForm.inc.php on line 18**
**[22-Mar-2022 00:36:01 Asia/Baghdad] PHP Warning:  Declaration of ManageCopyeditFilesForm::execute($stageSubmissionFiles, $fileStage = NULL) should be compatible with ManageSubmissionFilesForm::execute($stageSubmissionFiles = NULL, $fileStage = NULL, ...$functionArgs) in /home2/****************/public_html/lib/pkp/controllers/grid/files/copyedit/form/ManageCopyeditFilesForm.inc.php on line 18**
**[22-Mar-2022 00:36:02 Asia/Baghdad] PHP Fatal error:  Uncaught Error: Call to a member function getAssocId() on null in /home2/*********************/public_html/lib/pkp/controllers/grid/files/SubmissionFilesCategoryGridDataProvider.inc.php:131**
**Stack trace:**
**#0 /home2/**************************/public_html/lib/pkp/classes/controllers/grid/CategoryGridHandler.inc.php(402): SubmissionFilesCategoryGridDataProvider->loadCategoryData(Object(Request), 4, Array)**
**#1 /home2/***************/public_html/lib/pkp/classes/controllers/grid/CategoryGridHandler.inc.php(124): CategoryGridHandler->loadCategoryData(Object(Request), 4, Array)**
**#2 /home2/*****************/public_html/lib/pkp/classes/controllers/grid/CategoryGridHandler.inc.php(473): CategoryGridHandler->getGridCategoryDataElements(Object(Request), 4)**
**#3 /home2/*************/public_html/lib/pkp/classes/controllers/grid/CategoryGridHandler.inc.php(453): CategoryGridHandler->_renderCategoryInternally(Object(Request), Object(SelectableSubmissionFileListCategoryGridRow))**
**#4 /home2/*******/public_html/lib/pkp/classes/controllers in /home2/*******/public_html/lib/pkp/controllers/grid/files/SubmissionFilesCategoryGridDataProvider.inc.php on line 131**```