CVXPY
Maximize
  x
Subject To
 16: exp(x) <= 1.0
Bounds
 x free
End
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AFTER COMPILATION
Either candidate conic solvers (['SCIP']) do not support the cones output by the problem (ExpCone, NonNeg), or there are not enough constraints in the problem.
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SCIP
Maximize
 Obj: +1 x
Subject to
\   [nonlinear] <16>: exp((<x>)) <= 1;
Bounds
 x free
End