Disciplined convex programming error: Cannot perform the operation: {convex} .* {convex}

错误使用 .*
Disciplined convex programming error:
Cannot perform the operation: {convex} .* {convex}

出错 * (第 36 行)
z = feval( oper, x, y );

出错 Energy_BCD (第 78 行)
power_fly(l) = c1pow_pos(norms(V1(:,l),2),3)+(c2inv_pos(z(l)))*(1+pow_pos(norms(A1(:,l),2),2)/pow_pos(g,2));
How to solve?

Have you proven your optimization problem is convex?