EV SIMULATION, solver configuration, Block error ,

Hi,

I would like to simulate an EV using Simscape toolbox. when i run simulation following error occurs,

 Initial conditions solve failed to converge.
...Nonlinear solver: Linear Algebra error. Failed to solve using iteration matrix.
......Dependency found among topology equations. Check for missing reference node.

this error is related to used solver configuration block. please help me to fix this problem.

[K E]

While I can't help with this error, there is a webinar on modeling electric vehicles with Simscape that may be helpful, http://www.mathworks.com/company/events/webinars/wbnr50682.html?id=50682&p1=772993539&p2=772993557 .