Hello Leo,
It is difficult to see from the pictures, but it looks like you have predefined the sizes of your signals. The dimensions of the signals going into the mux is not matching with what Simulink is expecting from the output. You can check this by double clicking on the problematic blocks and see which rule Simulink uses to determine the size and type of the signal.
To me it looks like the state space block is expecting a signal of the size 10x1, and the signal given to the mux is larger than that.
Kind regards,
Dennie
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