Had this PHP fatal error for a while now...
 

Been having this fatal error for a while now and can't pin it down...

PHP Fatal error: Call to undefined function do_you_bop() in /home/public_html/includes/functions.php(3537) : eval()'d code

which refers to:
($hook = vBulletinHook::fetch_hook('navbits')) ? eval($hook) : false;

If anyone could help figure this out...would be grateful...

Check your plugin list and find all navbits hooks and disable them one by one until you find the one which is causing this.

Hint: Many users do not know that you can sort the plugins by hook name. Click in the header bar "HOOK LOCATION / PRODUCT". You will notice the the title is underlined indicating a link. :)

Then follow along with @Dave's suggestion in the last link.

thanks....
found it which was referring to Advanced [YOU] BB Code by BOP5 @ hook location "Advanced [YOU] in NAVBAR (breadcrumbs) x"

Glad to hear. :)