I am experiencing an issue with debugging SharePoint 2013 Workflows in a SharePoint App solution:
Has anyone encountered this error?
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As strange as it may seem, this error is often experienced when you are debugging a SharePoint App and you never had published your solution (so the solution package has not been created). Use the "Publish" command to create the package and debugging should work normally afterward.
Notice that the deploy functionality works even without the publish step so that could create some confusion.