Activity could not be loaded because of errors in the XAML

Recently I have started creating SharePoint 2013 workflows using SharePoint Hosted Apps. I created and tested the workflow successfully. But suddenly workflow designer displaying following error when I have reopened the workflow.


I was able to resolve this issue by adding following reference.
Microsoft.SharePoint.DesignTime.Activities.16.0.Design

Not sure why it was not added automatically.

Comments

  1. Scott HooperJune 5, 2018 at 2:31 AM

    This did not help me. The reference was already in the project file and the dll was found in the appropriate directory. Using VS2017 Community v15.0.0+26228.12.

    I get this problem only with a SIngleTask object on my workflow designer canvas. I can add it and configure, but when I save and reopen I see the error.

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