call to undefined function

i jacked some stuff up. i was disabling my plugins to begin the upgrade to 2.2.2 but got a little trigger happy during the process and didn’t wait for one of ’em to stop deactivating. now i get this pretty error:

Fatal error: Call to undefined function: unregister_sidebar_widget() in /homepages/19/d94969394/htdocs/htdocs/wordpress/wp-content/plugins/mr_links_widget.php on line 128

i don’t suppose there’s someone who would be willing to help me out with this? i had already made a local backup of what was on the server, but when i reloaded it in an attempt to fix this problem, nothing changed.

https://www.wannaberockstar.net