Convert Docx to pdf failed. error: The input file appears to be corrupted and cannot be processed.;

Dear team,

 Our code service of converting docx to pdf works well before and our IT team didn't update the code. But one day the function has some problem that there is an error showed below. I'm sure the docx file is ok and can be opened. Please help to have a look at the error and kindly to give me a feedback. Thanks a lot~

"errors": [
{
"message": "InternalServerErrorException: Failed to sign the document\nPath: C:\\Users\\maria.zhou\\Desktop\\Study\\Engagement-Letter\\backend\\upload\\P25-00003_EL.docx.\nError: The input file appears to be corrupted and cannot be processed.; requestId=dd322948-c09b-464e-8ea1-0899b7fb4f6a",
"locations": [
{
"line": 2,
"column": 3
}
],
"path": [
"uploadEngagementLetterFile"
],
"extensions": {
"code": "INTERNAL_SERVER_ERROR",
"stacktrace": [
"Error: InternalServerErrorException: Failed to sign the document",
"Path: C:\\Users\\maria.zhou\\Desktop\\Study\\Engagement-Letter\\backend\\upload\\P25-00003_EL.docx.",
"Error: The input file appears to be corrupted and cannot be processed.; requestId=dd322948-c09b-464e-8ea1-0899b7fb4f6a",
" at C:\\Users\\maria.zhou\\Desktop\\Study\\Engagement-Letter\\backend\\node_modules\\.pnpm\\@avista+nestjs-logger@2.1.5_@nestjs+common@9.4.3_reflect-metadata@0.1.14_rxjs@7.8.1__@nestjs+_axroniocw6hhtvsbk3h7nsa3va\\node_modules\\@avista\\nestjs-logger\\logger.interceptor.js:47:49",
" at Observable.init [as _subscribe] (C:\\Users\\maria.zhou\\Desktop\\Study\\Engagement-Letter\\backend\\node_modules\\.pnpm\\rxjs@7.8.1\\node_modules\\rxjs\\src\\internal\\observable\\throwError.ts:123:68)",
" at Observable._trySubscribe (C:\\Users\\maria.zhou\\Desktop\\Study\\Engagement-Letter\\backend\\node_modules\\.pnpm\\rxjs@7.8.1\\node_modules\\rxjs\\src\\internal\\Observable.ts:244:19)",
" at C:\\Users\\maria.zhou\\Desktop\\Study\\Engagement-Letter\\backend\\node_modules\\.pnpm\\rxjs@7.8.1\\node_modules\\rxjs\\src\\internal\\Observable.ts:234:18",
" at Object.errorContext (C:\\Users\\maria.zhou\\Desktop\\Study\\Engagement-Letter\\backend\\node_modules\\.pnpm\\rxjs@7.8.1\\node_modules\\rxjs\\src\\internal\\util\\errorContext.ts:29:5)",
" at Observable.subscribe (C:\\Users\\maria.zhou\\Desktop\\Study\\Engagement-Letter\\backend\\node_modules\\.pnpm\\rxjs@7.8.1\\node_modules\\rxjs\\src\\internal\\Observable.ts:220:5)",
" at C:\\Users\\maria.zhou\\Desktop\\Study\\Engagement-Letter\\backend\\node_modules\\.pnpm\\rxjs@7.8.1\\node_modules\\rxjs\\src\\internal\\operators\\catchError.ts:121:25",
" at OperatorSubscriber._this._error (C:\\Users\\maria.zhou\\Desktop\\Study\\Engagement-Letter\\backend\\node_modules\\.pnpm\\rxjs@7.8.1\\node_modules\\rxjs\\src\\internal\\operators\\OperatorSubscriber.ts:79:13)",
" at OperatorSubscriber.Subscriber.error (C:\\Users\\maria.zhou\\Desktop\\Study\\Engagement-Letter\\backend\\node_modules\\.pnpm\\rxjs@7.8.1\\node_modules\\rxjs\\src\\internal\\Subscriber.ts:91:12)",
" at OperatorSubscriber.Subscriber._error (C:\\Users\\maria.zhou\\Desktop\\Study\\Engagement-Letter\\backend\\node_modules\\.pnpm\\rxjs@7.8.1\\node_modules\\rxjs\\src\\internal\\Subscriber.ts:124:24)"
]
}
}
],