error in simulating matdyn

[aarthi n]

Sir,
      I tried to run the example file case9dyn usinf the command
rundyn('case9','case9dyn','fault').
 The error is "Assignment between unlike type is not allowed" .
Error in mpopt(31)=0;

Kindly help to resolve this error or is there any other way to simulate
case9dyn example given in the manual.

Thanks and regards,
Art