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While there can be many reasons that there would be errors on startup, the most common cause in our experience is a version conflict between different Revolution Design addins. We’ll spare you the technical details, but because of how Revit and .NET technology work, different addins that use the same code libraries can cause a conflict, so if you have an old version of Keynote Manager and a new version of workFlow or vice versa there may be a conflict over the shared code libraries. Try updating to the latest build of any RD software title you have installed and the error will usually clear up.