Upgrading database...
Moving metadata storage for categories... Upgrading database from version 4.0036. Assigning junk status for TrackBacks... (100%) Assigning junk status for comments... (100%) Removing unnecessary indexes... Upgrading metadata storage for Entries (100%) Upgrading metadata storage for Pages (100%) Upgrading metadata storage for Assets (100%) Upgrading metadata storage for Images (100%) Upgrading metadata storage for Users (100%) Moving metadata storage for categories...
Error during upgrade: Undefined subroutine &CustomFields::Upgrade::customfieldsmovemeta called at lib/MT/Upgrade.pm line 1037.
Any updates on this? I've run into this error as well and can't get any further. Had to restore a backup.
+1 to this, had exactly the same error. If it's any help in clarifying, I had the customfields plugin installed when I tried to upgrade.
This error message occurs because you need to remove the old version of Customfields from your plugin directory. The new Customfields lives in the add-on directory, and MT gets confused by having both versions of the plugin installed. Just delete the CustomFields directory from /mt-home/plugins/.