I formulate a mixed integer linear programing, and I have already got a CVX professional licence and the Gurobi licence, and installed both of them in matlab.

Now I use them to solve the MIDCP problem in SDP mode, after the first iterations, I have got the solution, however, the second iteration is failed. An error message is as follows:

And the matlab code is as follows:

The variables are t(m), u, r_bh_fixedC(m), and the above forms are all scalars. Why I cannot run the second iterations.

If you reading this, I really need your help.

Thank you.