NUnit + BadImageFormatException

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I got NUnit to run by telling VS to copy the NUnit.Framework dll locally.  However, when i tried starting nunit i got the following exception:

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Exception Details
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System.BadImageFormatException: The format of the file 'Testing.Collections.Tests' is invalid.

File name: "Testing.Collections.Tests"

Server stack trace:
   at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Boolean isStringized, Evidence assemblySecurity, Boolean throwOnFileNotFound, Assembly locationHint, StackCrawlMark& stackMark)

   at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Boolean stringized, Evidence assemblySecurity, StackCrawlMark& stackMark)

   at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark)

   at System.AppDomain.Load(String assemblyString)

   at NUnit.Core.TestSuiteBuilder.Load(String assemblyName)

   at NUnit.Core.TestSuiteBuilder.Build(String assemblyName, Int32 assemblyKey)

   at NUnit.Core.RemoteTestRunner.BuildSuite()

   at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)

   at System.Runtime.Remoting.Messaging.StackBuilderSink.PrivateProcessMessage(MethodBase mb, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs)

   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg, Int32 methodPtr, Boolean fExecuteInContext)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)

   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)

   at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)

   at NUnit.Core.TestDomain.LoadAssembly(String assemblyFileName, String testFixture)

   at NUnit.Util.NUnitProject.LoadTest(TestDomain testDomain, String testFixture)

   at NUnit.Util.TestLoader.LoadTest()

 

=== Pre-bind state information ===

LOG: DisplayName = Testing.Collections.Tests
 (Partial)

LOG: Appbase = C:\Development\cyrusn\Testing\Testing.Collections.Tests\bin\Debug

LOG: Initial PrivatePath = C:\Development\cyrusn\Testing\Testing.Collections.Tests\bin\Debug

Calling assembly : nunit.framework, Version=2.1.4.0, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77.

===

LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).

LOG: Post-policy reference: Testing.Collections.Tests

LOG: Attempting download of new URL .

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OK  
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My guess is that NUnit doesn't support assemblies that use the new runtime features like generics.  I'm going to see if I can work around this at all.