Model is unsuitably constrained (i.e. there were still some variables left to be computed, and some unusable equations left over).
At the time of the error, the following variables were found:
* Undefined: v in component gating_Iks
* Undefined: alpha_act in component gating_Iks
* Undefined: beta_act in component gating_Iks
* Undefined: ks_1 in component gating_Iks
* Undefined: ks_2 in component gating_Iks
* Undefined: ks_3 in component gating_Iks
* Undefined: ks_4 in component gating_Iks
* Undefined: ks_5 in component gating_Iks
* Undefined: ks_6 in component gating_Iks
* Undefined: tau_ks_const in component gating_Iks
* Undefined: x_ks_inf_act in component gating_Iks
* Undefined: tau_ks_act in component gating_Iks
The following equations couldn't be used:
* Equation with no id on the apply or math element.
* Equation with no id on the apply or math element.
* Equation with no id on the apply or math element.
* Equation with no id on the apply or math element.
* Equation with no id on the apply or math element.
* Equation with no id on the apply or math element.