Hello, I trying to design and simulate cmos Op-amp. I have done DRC,LVS and QRC without any error here is a screenshot: DRC: [URL]http://i44.tinypic.com/2428jkk.png[/URL] Note: there are some warnings however my professor asked us to ignore these errors. LVS: [URL]http://tinypic.com/r/rmiq6b/5[/URL] and [URL]http://tinypic.com/r/28jiln6/5[/URL] QRC: [URL]http://tinypic.com/r/2w5nfpd/5[/URL] ERROR (OSSHNL-116): Unable to descend into any of the views defined in the view list, 'spectre av_extracted', for the instance 'avD24_1' in cell 'op-amp'. Either add one of these views to the library 'PRIMLIB', cell 'nfetdiode' or modify the view list to contain an existing view. End netlisting Jan 24 15:11:01 2012 ERROR (OSSHNL-514): Netlisting failed due to errors reported before. Netlist may be corrupt or may not be produced at all. Fix reported errors and netlist again. ....unsuccessful. Is that a problem with the schematic or layout that I need to modify. Regards Zubair.