Note: No compatibility mode selected! Circuit: ** sch_path: /home/sahana/inverter/xschem/inverter_tb.sch Doing analysis at TEMP = 27.000000 and TNOM = 27.000000 Checking parameters for BSIM 4.5 model x1.xm1:sky130_fd_pr__nfet_01v8__model.25 Fatal: Pclm = -0.0968433 is not positive. Fatal: Drout = -0.261499 is negative. Warning: Cdscd = -0.00649389 is negative. Warning: Eta0 = -0.0934787 is negative. Fatal error: detected during BSIM4v5.5.0 parameter checking for model x1.xm1:sky130_fd_pr__nfet_01v8__model.25 of device instance m.x1.xm1.msky130_fd_pr__nfet_01v8 doAnalyses: no such parameter on this device tran simulation(s) aborted Error: no such vector in in term: v(in) Doing analysis at TEMP = 27.000000 and TNOM = 27.000000 Checking parameters for BSIM 4.5 model x1.xm1:sky130_fd_pr__nfet_01v8__model.25 Fatal: Pclm = -0.0968433 is not positive. Fatal: Drout = -0.261499 is negative. Warning: Cdscd = -0.00649389 is negative. Warning: Eta0 = -0.0934787 is negative. Fatal error: detected during BSIM4v5.5.0 parameter checking for model x1.xm1:sky130_fd_pr__nfet_01v8__model.25 of device instance m.x1.xm1.msky130_fd_pr__nfet_01v8 doAnalyses: no such parameter on this device run simulation(s) aborted ngspice 2 ->

@vishavisahli remove all the parameters of FET and try once