I upgraded OJS from 18.104.22.168 to 3.0.2, everything worked fine.
I'd like to have some more metadata fields, so I searched the forum and found the (unfinished) Custom Metadata Plugin.
I installed this and after that OpenAIRE, to try it out.
Now when I click New Submission, OJS hangs. The error log says:
PHP Warning: Invalid argument supplied for foreach() in .../lib/pkp/classes/submission/form/PKPSubmissionSubmitStep1Form.inc.php
on line 36, referer: http://.../submission/wizard
I deleted the plugins, but is has no effect.
Can anyone help me?