[SOLVED] Atahualpa corupted by plugin - HELP!

After deactivating “Simple Facebook Link” plugin because it stopped working, my page right sidebar disappeared and an error code at the bottom of the page appeared and all the other post below the main post are missing:

Fatal error: Call to undefined function: simple_facebook_link() in /home/content/D/a/v/Daves300WinMag/html/TRAVEL/wp-content/themes/atahualpa/functions.php(478) : eval()'d code on line 21

It appears to be calling for something that does not exist.

I communicated with the plugin developer and he has given up on helping me solve this problem.
I have been troubleshooting this for the last two days to no avail. I’ve tried everything I know and nothing has fixed it.

I’ve deleted files and folders, reinstalled WP and Atahualpa. I’ve searched for any reference to Facebook in all the files on the server and there is nothing.

The only way to make the right sidebar appear is to reinstall and activate the plugin that still does not work correctly.

Please somebody help me, my hair is falling out! It makes no sense to me.

http://GrayStarCity.info