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.

 

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.

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

  1. Maria says:

    Thank you! Saved me a lot of time!

  2. robert says:

    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?

  3. Pankaj Bajpai says:

    Thanks a lot…

  4. Jennifer says:

    Thank you very much!! I couldn’t figure out why I was getting this error. That solved the problem.

  5. RB says:

    just close the visual studio and open again… worked for me

  6. maratgaleyev says:

    Thank you, sir!

  7. Crazyyyyy simple and logical. Thanks for sharing this.

  8. Jacob Mathew says:

    thank for this it saved my time

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