above netlist file is showing error : not able to find model file.....I need to implement CMOS inverter.Is model file addition is correct in above netlist

I take it you have the spice library at that location?

Yes

Why do you use .include and not .lib?

I think if you change to

.lib ... tt

things will work better

Okay will modify it and check

also see Stefan's comprehensive suggestions below (he didn't answer in thread)

Yes@matt venn..checked ..his valuable suggestions worked

Super! :-)

Thansk@bluecmd