Error java.lang.castclassexception

i download a asset form,and i improted to the JME,when i click to run assetfilename.obj file its shows error to me,any one know to this solution.

The error being…

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That’s easy. You just have to fix the problem.

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I would guess that the .obj is not Java code ergo the error (which is missing).

OH and if your in an IDE did you not get some syntax highlighting showing “We have a problem Houston”???