I am upgrading my OJS 2.4.7 to OJS 3.1.1-1. Unfortunately, after 5 minutes of upgrade I got the following error:
Invalid File!
When I opened the Apache error.log there does not appear nothing, it just says:
[Wed Sep 26 18:53:54.521010 2018] [:error] [pid 14352:tid 2020] [client ::1:53294] ojs2: Invalid file!, referer: http://localhost/ojspujcali/index.php/index/install/upgrade
How I could fix this error?
Thank you so much