When i use cvx to solve this proble, something wrong occurs, can you help me?

[Mark_L_Stone]

If you examine the input data values in the statement generating the error, I think you will see at least one of them is NaN, which CVX can’t deal with.

What's wrong with cvx?

Elaborating on @jackfsuia 's answer, if one iteration of CVX fails due to being infeasible or solver numerical difficulty, the variable values are populated with NaN, which are then fed in as input data to the next iteration. CVX considers NaN input data to be invalid, hence the error message. You should ask not what is wrong with CVX, but what is wrong with crude, unsafeguarded SCA.