Note: No compatibility mode selected! Circuit: ** sch_path: /home/manohar/untitled.sch Error: unknown subckt: xm1 net1 net2 0 0 sky130_fd_pr__nfet_01v8 0.15 {1*nf=1 ad=()int((nf+1)/2)} 1.0 0 {()int((nf+2)/2)}} {()2*int((nf+1)/2)}} {()2*int((nf+2)/2)}} {()0.29}} {()0.29}} 0 0 0 1 1 Simulation interrupted due to error! ngspice 11 -> edit untitled.spice ^[ Note: No compatibility mode selected! Circuit: ** sch_path: /home/manohar/untitled.sch Error: unknown subckt: xm1 net1 net2 0 0 sky130_fd_pr__nfet_01v8 0.15 {1*nf=1 ad=()int((nf+1)/2)} 1.0 0 {()int((nf+2)/2)}} {()2*int((nf+1)/2)}} {()2*int((nf+2)/2)}} {()0.29}} {()0.29}} 0 0 0 1 1 run circuit? n running circuit Error: there aren't any circuits loaded.

@User The error seems to be that ngspice is not able to recognise the library files