Please study the examples on subckt units and components in the Simulation Tutorial carefully. The name of the subckt for a component defined by .subckt \<name> is \<name> and not .subckt \<name> So your name for the moc3080 should be moc3080 and not .subckt moc3080 And similarly your name for the BT134-800 should be BT134-800 and not .subckt BT134-800 For more help you will need to make your project public.

@andyfierman Great info, thank you. I will check out Sim tutorial.

@andyfierman sy jg punya masalah y sama saat simulasi, solusinya gmn ya pak ?

@sae_banie, Simulasi Anda bersifat pribadi sehingga hanya Anda yang dapat melihatnya. Simulasi Anda gagal karena Anda menggunakan setidaknya komponen yang bukan dari pustaka Spice Symbol (LM5575) dan karena itu tidak memiliki model spice yang terkait dengannya. Silakan pelajari Tutorial Simulasi (3) di (2) di: [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)<br> <br> dengan hati-hati. Maaf tidak ada terjemahan yang tersedia. <br> Your simulation is private so only you can see it. Your simulation fails because you are using at least on component that is not from the Spice Symbol library (LM5575) and therefore has no spice model associated with it. Please study the Simulation Tutorial (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)<br> <br> carefully. Sorry that there is no translation available.