Unable to open a document using DocumentApp.openById() in google app script

Question

I am trying to create a copy of a template document and edit some text in it using the following code :

 const destinationFolder = DriveApp.getFolderById(folderId) //folder where to save the document 
 const copy = templateDoc.makeCopy(customDocName.toString(), destinationFolder); //make a copy of the template document
 const doc = DocumentApp.openById(copy.getId()) //open the copy 
 const body = doc.getBody();
 
 //update the template with data
 body.replaceText('<text1>', 'replacementText');
 body.replaceText('<text2>', 'replacementText'); 

I am able to create a copy of the document, rename it and save it in the specified folder . I am getting the following error at line 3 : Exception: The document is inaccessible. Please try again later.

I have looked for the solutions and have tried all but nothing worked.

Here is all that I have tried :

• Logout and login again
• Enabled all relevant api under resources
• Moved the app script under a GCP project as someone suggested that we no longer can access a doc directly from app script.
• Enabled all relevant api's in GCP

Answer 1

The issue was with the templateDoc as it was a Microsoft Word Document(.docx). When i created a Google Doc and referred it as the template doc it worked just fine. Thank you for all your help :)