Autoroute problem

Hello everybody,
I have designed a schematic in OrCAD Capture CIS and then created netlist. And then I am able to open the file in OrCAD Layout Plus. But on selecting Autoroute Spectra-->Launch Spectra, I get the series of messages
1.) Too many parameters were specified on command line.
2.) Layout to SPECCTRA   Version 16.0.0
    Copyright 1985-2006 Cadence Design Systems, Inc.

    ERROR (Layout to SPECCTRA), Unexpected DB Version found
    Translate time 0 seconds
3.) The problem preventing translation of your file into DSN format must be corrected before the SPECTRA router can be used.

Please help me solve this issue.
Thanks in advance.

Regards,
Anay