How can I slove this problem? Disciplined convex programming error: Cannot perform the operation: {real affine} ./ {real affine}

My problem is given as follows

and when I use the CVX,it report the following error

Any help is appreciated!

Move the denominator to the RHS, because it is nonnegative due to W being hemitian semidefinite. Then it is an affine constraint, which CVX will accept.

Thanks a lot for dealing with my question!