Hi @bozana
In my last update from 3.0.2 to 3.1.0, I hit the error discussed in that topic
https://forum.pkp.sfu.ca/t/upgrade-from-ojs-3-0-2-to-ojs-3-1-problem/34592
I got a blank page at the attempts via web interface, then I tried the command line. I applied the upgrade as in docs.
php tools/upgrade.php upgrade
Now, I have ojs 3.1.0 code, but I notice that database was not updated properly. When I try to upgrade to 3.1.0.1 I got duplicate key errors pointing a previously failed upgrade attempt. I have several poblems that I should write elsewhere. I checked doaj fix, and all are already done. I will wait and read other topics,
Regards,
Ugur Kocak