Word found unreadable content... not able to open document

Hello Everyone,

We are a user of webMethods Agileapps Cloud

We use Docx based templates to automatically generate documents. Suddenly the word generated documents can not be open by Word, showing the error message:

Word found unreadable content in xxxxx.docx. Do you want to recover the content of this document? If you trust the source of this document, click yes.

When clicking yes the following error message appears:

Word experience an error in trying to open the file. Try these suggestions
Check the file permission for the document or drive
Make sure there is sufficient free memory and disk space
Open the file with the Text recovery converter

word error message 2

None of the options offered are able to open the auto generated document!!

Is there any solution to this problem??