Attempting to run a Test Studio test from the VS 2012 Test Explorer window produces the following output: ------ Discover test started ------ Failed to configure settings for runsettings plugin 'VSTest Run Configuration' as it threw following exception: 'An error occurred while loading the settings. Error: Could not find 'RunSettings' node..' Please contact the plugin author. An exception occurred while test discoverer 'TestDiscoverer' was loading tests. Exception: Type 'ArtOfTest.Common.Design.Extensibility.Descriptors.DescriptorConstraints' cannot be added to list of known types since another type 'ArtOfTest.Common.Design.Extensibility.Descriptors.DescriptorConstraints' with the same data contract name 'http://artoftest.com/schemas/WebAiiDesignCanvas/2.0.0:DescriptorConstraints' is already present. If there are different collections of a particular type - for example, List<Test> and Test[], they cannot both be added as known types. Consider specifying only one of these types for addition to the known types list. ========== Discover test finished: 0 found (0:00:00.751) ==========