[ns] Gettig error in simulation (ABORTING...)

[Seyed Amin Hosseini Seno]

Dear all,
Hi,
After running simulation and just  after completed through 6 secs ....Im  getting the below error in ns2.

void _ABORT(...) --- ABORTING...
Aborted (core dumped)

Would you please Advise me about this error. I m waiting for your reply.
Best Regards 
Amin

-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.