I am using the PCAD2004 in that i am not finding any option to import the netlist.
Now i am having the netlist generated from orcad->netlist->others->pcad but i am not finding in tool option to import netlist
The error you are getting says that PCAD can't read the file format produced by Orcad. Try using the Tango netlist format from Orcad instead. PCAD should be able to read that format.