i messed up a theme install and am getting an error

I have pinclone and wanted to update it. I needed to change the theme to another theme and then delete pinclone. Then install the new version of pinclone. I messed up and now the home page of the site loads an error. the site is http://www.cornerecho.com It says Fatal error: Call to undefined function of_get_option() in /home4/corner27/public_html/wp-content/plugins/my-custom-functions/my-custom-functions.php on line 11 I don;t know what to change tp get that to fix. I have attached the file in question if you need to look at.
I appreciate your help
Steven Q