@Amr_Tawfik This is a warning ngspice outputs when reading the spice models of the sky130 pdk. I have the same warning. the m= parameter set in your schematics will work just fine. This should be fixed (@Tim Edwards). the

m=

parameter is an instance multiplier and should not be set in any .subckt line. I hope there is no

m

parameter used anywhere with a different meaning, this would be a terrible choice.

I think there was an instance of that in the model files, but it was modified to avoid the obvious problem.