Clash Detection in Revit Using Dynamo(3D View Error) Help

Hi… I am new to dynamo… recently i found in this live clash detection in autodesk. i download and saw videos of class. i try same model wht shown in video, clash was detecting and clash detector also creating. but 3d views is not creating, dynamo script run with some error. so someone please help to resolve that error.
i attached png in below link.