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Getting error while calling interopModel.Prepare(gd)

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Hi,
When i want to load the interop model of my 3d model, i got an error at "interopModel.Prepare(gd)",
the error:
{
System.ArgumentException was unhandled by user code.
Message=[Argument_AddingDuplicate]
}
i tested some other 3d models, and i got this error for all of them(i attached one of my models. You can test that)!
The interopModel only works well,when i use 3d models that exist in source of this project.
is this a bug or my 3d models have problem!?
 
Thanks a lot (i apologize about my English)

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