Asking for help：I don't know why the line of code cvx_end is giving an error; my CVX version is 2.2, so I would like to inquire about the reasons behind the occurrence of this issue

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I can’t see exactly what the error is, but an error at cvx_end usually is indicative of some type of installation error or incompatibility, or possibly a corrupted MATLAB session.

I recommend reinstalling CVX. You might as well install CVX 2.2.2. And do it in a new session of MATLAB.