I'm trying to create a Workflow in a Sharepoint 2013 app, but whenever I try to "add" - "new item" - "workflow" I get the following error:
The reference 'Microsoft.Activities' could not be added to the project. This wizard will continue to run, but the resulting project may not build properly.
Workflow designer opens, but when I try to add something to it, for example a SingleTask I get an error:
Cannot create an instance of "SingleTaskFactory". "Could not load file or assembly 'Microsoft.Activities, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified."
My dev system: Windows 7, Visual Studio 2013 Pro (Update 3), Office developer Tools for Visual Studio 2013 ENU (12.0.30626).
Server is a SharePoint 2013 Standard.
Any ideas anyone?