[FIXED] Cant access piwik anymore after 3.0 update

Did an automatic update to Piwik 3 - now I cannot access the dashboard anymore, I am getting the following error:

An exception has been thrown during the rendering of a template (".form-description is undefined: failed at .form-description; line: 6259") in “@CoreUpdater/runUpdaterAndExit_welcome.twig” at line 8.

As downgrade to v2.7 by replacing the folder also failed (I guess as the database has already been updated?) I kindly ask for help - the sooner the better, as tracking is currently down :-/

Deleting the plugin folder /plugins/InterSites fixed the issue for me (thx for prompt Twitter support :slight_smile: - this plugin is currently not compatible with Piwik 3