infoRouter uses warehouse paths to store document contents and other meta files.
When a document content storage location in a warehouse is inaccessible, corrupted or not found this error will occur.
If you think the warehouse path (example P231312) is corrupted or missing you may restore the specific warehouse path from the latest backup.
If this problem occurs right after a warehouse migration or restore operation make sure you restored matching warehouse and database backups. If required restore again.