If you have Mosek available, use CVX 2.2. with Mosek as solver. If not, follow the advice in CVXQUAD: How to use CVXQUAD's Pade Approximant instead of CVX's unreliable Successive Approximation for GP mode, log, exp, entr, rel_entr, kl_div, log_det, det_rootn, exponential cone. CVXQUAD's Quantum (Matrix) Entropy & Matrix Log related functions if that doesn’t resolve matters, follow the advice below.
CVX reports that your problem is unbounded. Follow the advice in https://yalmip.github.io/debuggingunbounded/