After I have updated affilliate suites, it seems that when I try to save a post I get a server 500 error.(HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request.)

I contacted the server admin since I thought it was on their end and they checked the log and said it said this:

[31-Aug-2011 13:42:10] PHP Fatal error: Call to undefined function ms_core_log() in /sites/all/modules/ms_affiliates/ms_affiliates.module on line 1741

Any suggestions?