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Get the following in my Xamarin Studio log file:
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke (System.Runtime.Remoting.Proxies.RealProxy rp, IMessage msg, System.Exception& exc, System.Object& out_args) [0x00000] in <filename unknown>:0
System.TypeLoadException: Could not load type 'System.Runtime.CompilerServices.ExtensionAttribute' from assembly 'BlastOutServer.UnitTests'. at (wrapper xdomain-invoke) MonoDevelop.NUnit.External.NUnitTestRunner:GetTestInfo (string,System.Collections.Generic.List`1<string>)
at (wrapper remoting-invoke-with-check) MonoDevelop.NUnit.External.NUnitTestRunner:GetTestInfo (string,System.Collections.Generic.List`1<string>)
at MonoDevelop.NUnit.External.ExternalTestRunner.GetTestInfo (System.String path, System.Collections.Generic.List`1 supportAssemblies) [0x00008] in /Users/builder/data/lanes/monodevelop-lion-evolve_fixed/a8bf58d3/source/monodevelop/main/src/addins/NUnit/Services/ExternalTestRunner.cs:90
at (wrapper managed-to-native) System.Runtime.Remoting.RemotingServices:InternalExecute (System.Reflection.MethodBase,object,object,object&)
at System.Runtime.Remoting.RemotingServices.InternalExecuteMessage (System.MarshalByRefObject target, IMethodCallMessage reqMsg) [0x00000] in <filename unknown>:0
Probably need to update test runner to cope with Mono / .NET 4.5 assemblies.
I can second this error. Running Xamarin studio on MacOS X. Tried to use NUnit from Nuget after updating project to 4.5. Removed all nunit references and fetched NUnit from Nuget again. Same error.
I am also getting this error occasionally with XS 5.6.2.
This was fixed at some point. Most of the Xamarin Studio assemblies are Mono / .NET 4.5 and the NUnit runner is used against those.