Getting Segmentation Error in Scripting

I have come across 'Segmentation Error' in my script. Script is for seleting particular surface elements and remeshing it with Spline option, and deleting prev. elements on user satisfaction. The script seems to be fine in context of Syntax and API uses. It would be helpful, if someone could tell me the common causes for this error. And, better, if someone could suggest solution to this problem. We thought it as error caused due to memory limitation. So, we have also used *clearmark every now and then. But, seems to not affect that much.

Thanks,

SAGAR MOTWANI