Model is underconstrained.
The following variables couldn't be defined:
 * i_Na in component fast_sodium_current
 * i_s in component slow_inward_current
 * i_x1 in component time_dependent_outward_current
 * i_K1 in component time_independent_outward_current
 * Istim in component membrane
 * IStimC in component membrane
 * alpha_m in component fast_sodium_current_m_gate
 * beta_m in component fast_sodium_current_m_gate
 * alpha_h in component fast_sodium_current_h_gate
 * beta_h in component fast_sodium_current_h_gate
 * E_s in component slow_inward_current
 * alpha_d in component slow_inward_current_d_gate
 * beta_d in component slow_inward_current_d_gate
 * alpha_f in component slow_inward_current_f_gate
 * beta_f in component slow_inward_current_f_gate
 * alpha_x1 in component time_dependent_outward_current
 * beta_x1 in component time_dependent_outward_current
 * x1 in component time_dependent_outward_current_x1_gate
 * alpha_x1 in component time_dependent_outward_current_x1_gate
 * beta_x1 in component time_dependent_outward_current_x1_gate
 * d/dt V in component membrane
 * d/dt m in component fast_sodium_current_m_gate
 * d/dt h in component fast_sodium_current_h_gate
 * d/dt Cai in component slow_inward_current
 * d/dt d in component slow_inward_current_d_gate
 * d/dt f in component slow_inward_current_f_gate
 * d/dt x1 in component time_dependent_outward_current_x1_gate