I was getting this error message in Visual Studio 2008 when adding a custom activity to an existing workflow. Solution This worked for me, your mileage, may and probably will vary. It was necessary for me to un-gac the workflow project, then the custom activities could be added to the design surface as expected.
Archive for the ‘workflow’ Category
SharePoint custom workflow activity. “Failed to load toolbox item. It will be removed from toolbox.”
Posted in sharepoint, workflow, tagged activity, bug, custom activity, custom workflow, sharepoint, workflow on December 27, 2009 | 6 Comments »
