# Constraints not accepted by the solver

I have a constant given below

\text{geo_mean}(t)\ge\Phi_{lower}\gamma

\text{geo_mean}(t)\le\Phi_{upper}\gamma

For the first constraint, the solver accepts it, but the second constraint is not accepted by the solver.
It shows an error as:

    Disciplined convex programming error:
Invalid constraint: {concave} <= {real affine}


How can i resolve this?

Your second constraint is not convex.

Your second constraint is not convex.