• TI Thinks Resolved

TINA/Spice: Simulation issues

Tool/software: TINA-TI or Spice Models

I am trying to implement the following circuit which is a model of EMI filter but it is showing error message as in the screenshot below. So let me know what I am supposed to do. (for below circuit)

Sometimes I also get message as floating node when implementing some other circuit randomly. (Not for below circuit)

I want to know whether it is necessary to put a ground to the circuit isolated by coupled inductor coils or transformer with AC supply? If yes, then where do I have to place as AC supply polarity keeps changing. (Not for below circuit)