I do not understand what you are posting. "Mutual_Inductors - The circuit has component without simulation model:undefined Mutual_Inductors2 - do not understand parameters. (default L1=1m L2=2m L3=3m R1=1u R2=1u R3=1u)  (U2+U3)/U1=30/155=0.2 L1/(L2+L3)=0.2; - good, but do not use capacitor with that/" Is this an error report from EasyEDA or is it you trying to ask a question? Have you modified the circuit in the link since you posted? I tried the circuit in your link and it runs OK: no errors. There is a warning however because you have no DC path to ground on the secondary side so the voltage shown by volprobe1 is poorly defined and looks rubbish. You must either ground the other side of the secondary or use some form of differential probe (search for "diffprobe"). Please read (3) in (2) in: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a)