That doesn’t sound like an AxCrypt error message. I think that’s a PDF parsing message which is a problem with your PDF reader.
- What format is the file?
- When did you last have access to it?
- What software is giving you the error message?
- Please upload a screenshot of the error message
If it’s an error with third-party software then AxCrypt cannot help you and you’ll need to contact the application developer of the third-party.