Use CVX 2.1 together with CVXQUAD 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
CVX 3.0beta is newer, and supports native exponential cone for SCS and ECOS. Unfortunately, it is riddled with bugs, so don;t use it.