CVXPY
Maximize
  x
Subject To
 16: exp(x) <= 1.0
Bounds
 x free
End
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AFTER COMPILATION
Either candidate conic solvers (['GUROBI']) do not support the cones output by the problem (ExpCone, NonNeg), or there are not enough constraints in the problem.
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GUROBI
Maximize
  x[0]
Subject To
 16[0]: exp_1[0] <= 1
Bounds
 x[0] free
 exp_1[0] free
General Constraints
\ exp_1[0] = exp(x[0])
 GC0: exp_1[0] = NL : ( EXP , -1 , -1 ) ( VARIABLE , x[0] , 0 )
End