I have tried to design a linear actuator by following all the steps in the given pdf. But at last, I get the message 'Impossible to solve the problem'.  
   Kindly help me in this regard. I am attaching the file herewith. 
    <?xml version="1.0" encoding="UTF-8"?>
 <?xml version="1.0" encoding="UTF-8"?>
 <?xml version="1.0" encoding="UTF-8"?>
 <?xml version="1.0" encoding="UTF-8"?>
   
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