1. The problem statement, all variables and given/known data Hi, I am trying to simulate a LISN circuit, using a 220V/50Hz as Line input, a signal generator as SMPS equipment emission. The circuit is as below: And then I have this error and the box comes out 2. Relevant equations 3. The attempt at a solution I am trying to see if a positive only signal or positive negative alternating signal will make a different to the simulation result. The problem is when I set, in the equipment box, the signal generator, V1 to any non-zero value, the error arises. V2 can be any value with V1=0, it works. Do you have any idea? Thank you for reading.