I followed the tutorial video as it is. https://spoken-tutorial.org/watch/eSim/Schematic+Creation+and+Simulation/English/
But when i ran the simulation ngSpice plots didnt came and instead an error had appeared .Python plots were working fine.
Before this I had tried to creat DC bias plots for MOSFET in that too first it gave me error in electrical rules check that power output of v1 is connected to power output of v2 (-ve of both were grounded)
I couldnt resovle that too.
unable to follow you. Please post the .cir.out file here and the screenshot of your circuit if possible