Model is underconstrained.
The following variables couldn't be defined:
 * x in component x in model file:///Users/Hanne/Desktop/repository%20models/kirschner_panetta_1998/kirschner_panetta_1998.cellml
 * d/dt x in component x in model file:///Users/Hanne/Desktop/repository%20models/kirschner_panetta_1998/kirschner_panetta_1998.cellml
 * d/dt y in component y in model file:///Users/Hanne/Desktop/repository%20models/kirschner_panetta_1998/kirschner_panetta_1998.cellml
 * d/dt z in component z in model file:///Users/Hanne/Desktop/repository%20models/kirschner_panetta_1998/kirschner_panetta_1998.cellml