Exception after upgrading to 2.1 from 2.0

Did you clear your caches?

I'm getting this as well. This basically makes the revisions page unusable. My caches have been cleared multiple times. Here's the exact error I'm getting:

warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'diff_diffs_overview' was given in /var/www/drupal/includes/menu.inc on line 348.

I updated my module from 2.0 to 2.1 via Drush 3. I'm guessing that probably didn't have anything to do with it, but just thought I'd mention it.

If it helps I also had the same error message and was fixed when I cleared caches.

still an issue?

Before marking as open, did the menu structure change in the menu alter? If so:

D6 solution

/**
 * Rebuild the menus.
 */
function diff_update_6001() {
  menu_rebuild();
}

D7 solution

/**
 * Rebuild the menus.
 */
function diff_update_7001() {
  // Just flag the rebuild as required, so if other updates call this, the rebuild is only done once.
  variable_set('menu_rebuild_needed', TRUE);
}

Closing due to inactivity.