Model is underconstrained.
The following variables couldn't be defined:
 * n in component potassium_channel_n_gate
 * n_initial in component potassium_channel_n_gate
 * alpha_n in component potassium_channel_n_gate
 * beta_n in component potassium_channel_n_gate
 * V in component potassium_channel_n_gate
 * d/dt n in component potassium_channel_n_gate