How do I solve a problem with the Trace of quadratic form

1

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In which A is a Hermitian matrix.
The error occurs as: Disciplined convex programming error:
Only scalar quadratic forms can be specified in CVX
I was wondering if it is possible to solve it via CVX ?

2

Apply the same transformation as in this answer you “liked” Help me for this objective function .

maximize(-square_pos(norm(sqrtm(A)*X,'fro')))

The argmax is preserved if instead you use maximize(-norm(sqrtm(A)*X,'fro')) which avoids unnecessary squarng, and might be better behaved numerically.

3

Thank you very much，I am a newbie in this community, and I found your answer after I asked the question. It realy helps a lot in my work.
Best wishes .