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Query: version=2019&prod=api&lang=english&path=swconst%2fSolidWorks.Interop.swconst%7eSolidWorks.Interop.swconst.swFileLoadError_e.html&format=P Help Exp:Exception of type 'System.Web.HttpUnhandledException' was thrown.:: Help Inner Exp:Object reference not set to an instance of an object.