External Tool ErrorHandling.dll 5173fedd-fdfd-4a52-8319-cb956bc3263e Revit.SDK.Samples.ErrorHandling.CS.Command ErrorHandling.dll 931e878f-635f-4163-b9c8-fd2dc59a3f7c Revit.SDK.Samples.ErrorHandling.CS.Command ErrorHandling Demonstrates how to use the error handling framework.. AlwaysVisible