Disciplined convex programming error: Illegal operation: {convex} + {concave}

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Here, Aopt and Eopt are variables. How to handle Aopt. * R_ Diff, I think the error is caused by the multiplication of two variables

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The forum readers don’t know what your actual optimization problem is. Your first task is to prove the optimization problem is convex. if it is not, you should use a different tool, such as YALMIP.