Question: Error in Battery operated 4 wheeled driven electric vehicle

Hi all,

I am new to maplesim and trying to learn it.

While simulation of the battery operated 4 wheeled driven electric vehicle 

it tells can't find solution.

 

 

Same time if i connect a fixed reference all four wheels are running (same place) but not moving since the frame fixed.

 

HELP ME TO SOLVE THIS.

 

thank you..

 

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