ERROR(SPMHNI-175) IN CREATING THE NETLIST

Hello Everyone,

I am electronic engineer working in Paris.

I am using ORCAD 16.6 for designing our schematics and PCB layout.

In order to design the PCB layout we need to create NETLIST file right.

So, while creating this netlist i have got following error

" ERROR: File "SNB_PSB.brd" is being edited by user "THABJUL" on date "Mon Nov 30 15:20:05 2015" on system "ANIRUDH_THABJUL". Resolve lock file and re-run netrev.

#1 ERROR(SPMHNI-175): Netrev error detected."

Can any body help me in solving this issue?

Regards,
Anirudh