Odd error when moderating threads

[SBlueman]

I am getting this error message when I go to validate a moderated thread:

Fatal error: Call to undefined function custom_convert_smart_quotes() in /home/gridiron/public_html/forums/includes/class_dm_threadpost.php(666) : eval()'d code on line 20

Does anyone know what would cause this or what the remedy could be?

[Lynne]

That is from a modification as there is no function custom_convert_smart_quotes in default vbulletin.

[SBlueman]

Disabling a custom modification that converted curly quotes to standard quotes worked. Thank you for your help.