I've got a weird problem with my JIRA installation. I'm not sure when it started happening or what change may have caused it, things used to work fine.
I can't move issues individually between projects or issue types, I get this error:
Errors
An exception occurred: com.atlassian.jira.util.dbc.Assertions$NullArgumentException: config should not be null!.
It doesn't matter what the source/destination issue type is, or project. Even trying to 'Move', keeping the issue type and the project the same doesn't work.
Weirdly however, if I do a Bulk Change it will let me move issues without any errors or problems at all. So I do have a workaround (although I have limited users that have access to Bulk Change, whereas everyone has access to Move).
Does anyone know where to start in debugging this problem, or what the cause might be?