When I try to upgrade a SharePoint 2013 app with an integrated workflow (add-in created in Visual Studio) it fails.

There was a problem accessing the file system on the server. Details: Cannot complete this action. Please try again.

Until I deleted al the tasks from the Workflow Task List (related to that workflow).

  • are these workflow tasks created with app only permission. – bkk Apr 11 '17 at 5:42
  • How do I check this? It's just the "SingleTask" building block that I dragged to the workflow... – MPrinsen Apr 11 '17 at 14:33

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