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Applying External Force on Material Studio

Dear all,

I am beginner for Material studio
I want to make the simultion that external force is applied to CNT.
so I tried to follow the perl script written by CHENG Xu in this question but I am getting this error: "External Force set not present in Forcite.Dynamics (function/property "Run") at -e line 34."
plz, let me know what is wrong with me
I am using material studio 8.0.

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CarstenCarsten (Accelrys) 
You have to define a set for the CNT on which the force will be applied. The ExternalForceSet parameter is used to hand over the name of that set to Forcite.