How to fix the error on Mac OS xcron?

HI all, I have been facing a problem as the corn. PHP script is giving me a error on my system.I am getting a error on mam os x cron. Warning: in_array() [function.in-array]: Wrong datatype for second argument in /Volumes/data/Websites/toolboxes/internal/trunk/sugar/modules/Schedulers/Scheduler.php on line 171 Warning: in_array() [function.in-array]: Wrong datatype for second argument in /Volumes/data/Websites/toolboxes/internal/trunk/sugar/modules/Schedulers/Scheduler.php on line 171 I am not able to understand why is this error coming , have I done something wrong or is it a technical fault, uys please help me out as I am totally confused about what I have to do.