Why do I have "Erroneous feedback connections"?

Hello,

I got the error: Erroneous feedback connection involving one or more virtual blacks starting at output port ... I am using Matlab 2016a.

The model is variant based, for one variant I got the problem for one not. I read that gains would help, that is true, but adding gain at all places isn't a good solution for me. (Especially if one variant has no problem at all) So I can fix one problem with a gain but then the next occurs, I have added like 20 gains but it goes on like that.

(I'm not allowed to share the model and I'm compiling the model)

Is there another solution to this problem?

Sincerely, Lucas

[mounika]

Try this: https://www.mathworks.com/matlabcentral/answers/97968-why-do-i-receive-an-erroneous-feedback-connection-error-in-simulink-6-0-r14-when-i-open-a-model?s_tid=answers_rc1-1_p1_MLT

[Lucas Maiß]

Matlab doesn't know 'BusPropagationForNVBlocks' ...