Hello everyone :)

I'm trying to migrate an old phpbb database to a Drupal environment. The test migrations have worked fine, so I went on to a more recent snapshot of the production database to test it there.

After having installed Migrate including Migrate UI and phpbb2drupal, enabling access to them and setting up phpbb2drupal, I tried to go to the Migrate pane under Content in order to start the migration - and I'm greeted with an error page.

Error message

I've tried changing the settings of phpbb2drupal, I've tried disabling and enabling phpbb2drupal and Migrate and Migrate UI, I've tried uninstalling and installing them (which doesn't seem to _really_ work anyway, since they stay visible in the Modules pane after uninstalling)... I tried removing what little trace of leftover old data that there was in the Drupal database (some rows in migrate_status)...

The problem seems similar to something I encountered once before during my migration work; phpbb2drupal got "stuck" with a faulty password that I had entered, and would not change it from the browser side. Whenever I entered the new (correct) password and hit "save", I would simply be greeted with an error page, much like the above. I figured out where the password was stored in the database (migrate_instances or something like that) in a specific field, and hand-edited the field in the database, and hey presto!

But now, I'm pretty much stuck.

Anyone got any ideas or encountered a similar situation? Not necessarily with phpbb2drupal or migrate?