How to solve this error

错误使用 - (line 27)
Disciplined convex programming error:
Invalid operation: {convex} - {convex}

出错 ceshi2 (line 59)
minimize (-KbatBAT-KfcFC-t2log(-(A3m-b3)(-A4m+b4)))

The forum readers don’t even know what is input data and what are the CVX variables and expressions.

Have you proven the objective function is jointly convex in all CVX variables?