Hi, I'm trying to simulate basic inverter. however its showing ngspice error, which i tried to clear with checking the ngspice codes and labels. So, can someone help me, plz.

It looks like the dimensions of the transistors inside the inverter are wrong. Please use a minimum L=0.15 and a minimum W=0.42. Do not use 'u' or 'e-6' suffixes as sky130 scales all numbers down by 1e6. If you are using _lvt transistors the minimum L must be somewhat higher.

@Stefan Schippers thank you for attention. yeah dimensions, paths, etc are correct. checked multiple times. I spend last night finding the problem and to my notice there was convergence issue. also i noticed sometimes symbols are not properly/ partially visible. i removed the xschem and installed again and out of nowhere it worked. 😅