Singular KKT matrix

Hello, everyone:

In my model, Muscle recruitment solver aborted due to singular KKT matrix in time step 0. I don't know what caused this error and how I should modify the model, I really appreciate if anyone could help me.

Best regards,


Hi @xlp_513

There are many posts on the forum regarding this issue
You can search for "KKT" and see if you can find relevant help.
Also try and read this post: Question about frictional contact elements

Best Regards,
AnyBody Technology

Hi Bjørn,

Thank you very much for your reply, It is so helpful for my research.

Best Regards,


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