lvs problem

I could not understand the problem. will you explain clearly.

To test my software, I draw a simple circuit. No DRC error for the layout. Run LVS, and come out the error message:

"no enough lvs data exists for this run
lvs may not have run to completion
lvs run not opened
"
My system is Red Hat Enterprise Linux 4. I don't have this problem in Red Hat Linux. Why?

There is another error:
"operating system error ocurred in vfork"

thanks!