Access to OA file circulation, internal SMS, email and other issues, please advise, how to solve?

1. Have you made any changes before? If there is no modification, please download the latest update package from official website;

2. Whether you modify the system page file or not, you can't return to the original state. You can cold backup the database and attachment folder first, then reinstall the original version of OA, and then restore the backup database and attachment folder after success. In this way, ordinary problems can be solved.