Error regarding Input port when using SIMULINK

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Sameema Tariq
Sameema Tariq on 24 Aug 2020
I have system which shows error in this way.
Error in port widths or dimensions. Output port 1 of 'SMC1/LQR_Controller/u' is a one dimensional vector with 3 elements.
Error in port widths or dimensions. Input port 1 of 'SMC1/LQR_Controller/MatrixB' is a one dimensional vector with 1 elements.
Although the MatrixB is receiving the same input as u 's output. Kindly guide me how do I resolve this error.
The image of system is given below:

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