Hello, only common libraries and system libraries in simulation mode can be simulated. Other libraries do not support simulation. I hope my advice will be helpful to you~

Hi poghos, Before attempting simulation in EasyEDA, you need to read 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)

@haidy_easyeda I have changed all of parts, but it keeps giving parts error

And in "System" have not my parts

If there is no part that you are using and it is not found in "system", then you can't simulate it. Can somebody confirm my statement? Regards, Markus Virtanen HW / Electronics Designer

@markus_jidoka, @poghos, A simple answer is that if a Spice Symbol for a part is not available in the Spice Symbol library in Sim mode then it cannot be simulated in EasyEDA. But that is not the whole answer which is why I marked the Simulation Tutorial (3) in Welcome to EasyEDA (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) as being **essential** to read **before** attempting simulation in EasyEDA. The Preliminary Remarks at the start of of the Simulation Tutorial describes not only this fact in detail but also describes the options available if a part does not exist in the Spice Symbol library.

Thanks Andy for the explanation :-) -Markus