I upgraded my OJS 18.104.22.168 to 22.214.171.124 via CPanel successfully. A problem occurred whn I tried to add List of Contributor to an article during the submission process. Once I click on “Add Contributor”, the fields for entering the other author names are not shown, just I got the following message: “ Failed Ajax request or invalid JSON returned. ”
The same problem happen for authors, editors, and journal managers during the submission process or editing uploaded article.
Your support would be appreciated a lot.