Model is underconstrained.
The following variables couldn't be defined:
 * n_initial in component membrane_current
 * m_initial in component membrane_current
 * h_initial in component membrane_current
 * V in component membrane_current
 * INa in component INa
 * IK in component IK
 * Ileak in component Ileak
 * Ii in component membrane_current
 * gK in component IK
 * gNa in component INa
 * g in component membrane_current
 * X in component hh_gating_variable
 * T in component membrane_current
 * VNa in component membrane_current
 * VK in component membrane_current
 * Vleak in component membrane_current
 * minus_V in component membrane_current
 * gNa_max in component membrane_current
 * gK_max in component membrane_current
 * gleak_max in component membrane_current
 * Cm in component membrane_current
 * alpha in component alpha_m
 * phi in component temperature_factor
 * beta in component beta_m
 * alpha in component alpha_h
 * beta in component beta_h
 * alpha in component alpha_n
 * phi in component temperature_factor
 * beta in component beta_n
 * d/dt X in component hh_gating_variable
 * d/dt X in component hh_gating_variable
 * d/dt X in component hh_gating_variable