Model is underconstrained.
The following variables couldn't be defined:
 * h in component h
 * Tn in component Tn
 * Tp in component Tp
 * fw in component fw
 * s2_ in component s2_
 * c in component fw
 * x in component model_parameters
 * d/dt h in component h
 * d/dt n in component n
 * d/dt p in component p
 * d/dt s1 in component s1
 * d/dt s2 in component s2
 * d/dt E in component E