Error in port widths or dimensions

Hello,

so i have a state space representation in simulink matlab, and i have this error:

Error in port widths or dimensions. Invalid dimension has been specified for 'Input Port 3' of 'dcmicrogrid14/plant model/Sum'.

Component:Model Predictive Controller | Category:Find Operating Point error

Error in port widths or dimensions. 'Output Port 1' of 'dcmicrogrid14/plant model/Gain' is a [2x2] matrix.

Component:Model Predictive Controller | Category:Find Operating Point error

3 inputs, 2 outputs=2 states,

and the gain are element.wise

in this case why A shouldn't be 2 by 2?

what is the error?

thanks in advance

[Sulaymon Eshkabilov]

It is a bit difficult to see your model (subsystem), it will be helpful to see the whole model.

[Mounira]

so i added a photo and the model in case you want to check

Answer 1

[Paul]

The system has 3 inputs, 2 outputs, and 2 states. The gain multiplications by A, B, C, and D need to be matrix*vector multiplications.

If that doesn't work, go to Debug->Information Overlays -> Signal Dimensions and post a screen capture after the diagram updates.