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:
 * Defined: v in component gating
 * Undefined: alpha in component gating
 * Undefined: beta in component gating
 * Undefined: tau in component gating
 * Undefined: act_inact in component gating
 * Undefined: x1 in component gating
 * Undefined: x2 in component gating
 * Undefined: x5 in component gating
 * Undefined: x6 in component gating
 * Undefined: x7 in component gating
 * Undefined: x4 in component gating
 * Undefined: x3 in component gating
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.