Summary
When you open a session, your session will not successfully open and you may receive the following error message:
Unexpected File Format
Cause
Copying a document class that contains a Form Identification process can potentially corrupt the current Quick Fields session. If this occurs, you will have to recreate your session.
Workaround
If you would like to copy a document class that contains a Form Identification process, then you should delete the Form Identification process and then copy and paste the desired document class. After the desired document class has been created, you should recreate the Form Identification process that was deleted.