Category Archives: workflow

SharePoint custom workflow activity. “Failed to load toolbox item. It will be removed from toolbox.”

I was getting this error message in Visual Studio 2008 when adding a custom activity to an existing workflow.



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.

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