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

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

December 27, 2009 by Edward Wilde

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.

Posted in sharepoint, workflow | Tagged activity, bug, custom activity, custom workflow, sharepoint, workflow | 2 Comments

2 Responses

on January 25, 2010 at 2:50 pm | Reply Maria

Thank you! Saved me a lot of time!
on February 12, 2010 at 10:09 pm | Reply robert

Thank you so much! I’ve been banging my head about this for the whole day…
How can one develop for sharepoint then, since the workflow libraries go into GAC everytime you deploy?

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