#481 ngspice can't find model of GND Issue created by MatiasJHZ Hello, I followed the steps in opencircuitdesign to install ngspice, xschem, magic and open_pdks. Everything was installed successfully, and now I can use skywater on xschem. This is the netlist I created:

** sch_path: /home/mati/IC_projects/test1/test_inverter.sch  
**.subckt test_inverter  
U1 VDD Vout Vin GND inverter  
V1 Vin GND PULSE(0 1.8 1ns 100ps 100ps 2ns 4ns)  
V2 VDD GND 1.8  
C1 Vout GND 10p m=1  
**** begin user architecture code

*.dc V1 0 1.8 0.01  
.save all  
.tran 0.01n 8n

.lib /usr/local/share/pdk/sky130B/libs.tech/combined/sky130.lib.spice tt  
**** end user architecture code  
**.ends

• expanding symbol: inverter.sym # of pins=4  
** sym_path: /home/mati/IC_projects/test1/inverter.sym  
** sch_path: /home/mati/IC_projects/test1/inverter.sch  
.subckt inverter VDD Vout Vin VSS  
*.opin Vout  
*.ipin Vin  
*.iopin VSS  
*.iopin VDD  
XM1 Vout Vin VSS VSS sky130_fd_pr__nfet_01v8 L=0.15 W=2 nf=1 ad=0.58 as=0.58 pd=4.58 ps=4.58 nrd=0.145 nrs=0.145 sa=0 sb=0 sd=0
• mult=1 m=1  
XM2 Vout Vin VDD VDD sky130_fd_pr__pfet_01v8 L=0.15 W=6 nf=1 ad=1.74 as=1.74 pd=12.58 ps=12.58 nrd=0.0483333333333333
• nrs=0.0483333333333333 sa=0 sb=0 sd=0 mult=1 m=1  
.ends

.GLOBAL VDD  
.GLOBAL GND  
.end

and when I simulate, I get the following error:

Note: No compatibility mode selected!

warning, can't find model 'gnd' from line  
u1 vdd vout vin gnd inverter

Circuit: ** sch_path: /home/mati/ic_projects/test1/test_inverter.sch

Error on line 3 or its substitute:  
u1 vdd vout vin 0 inverter  
Unable to find definition of model 0  
Simulation interrupted due to error!

The only step I haven't done yet from this webpage: <url|https://xschem.sourceforge.io/stefan/xschem_man/tutorial_xschem_sky130.html> is the creation of the .spiceinit file since I can't find the simulation folder. What am I missing here? was there a problem with my installation since ngspice can't find a model for ground? It is important to say that I can simulated the included example tests for skywater. RTimothyEdwards/open_pdks