How to fix this crazy error?

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I am getting the following error after trying to tune a model. It is crazy I cannot even run the model anymore because this error keeps popping up. Can anyone help me from going crazy myself?

Error: "The element 1 in SCDPotentialLinearizationIOs structure is not referring to an existing block in the model"

I was using Simulink Control design (SCD) and I had external hardware in the model controlled with a PID. I was using SCD to tune the PID but it won't work because it say there is no feedback-loop detected. Obviously there was a feedback-loop but it was on the external hardware. Given that feedback was not detected, I decided to 'computer operating points' and that was how the error started. The bad thing is that the error could not go away even after I have closed SCD and it does not seem to come from any particular block.

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Swarooph 2016-10-26

Is it possible to share the model? Seems like you are trying to 'tune' a model with IOs that don't exist anymore.. Also, tell us what you mean by 'tuning'. What tool/workflow are you referring to when you are tuning your model?