When I had a test list run, one of the test failed because it had this error. System.ArgumentNullException: Value cannot be null. Parameter name: pipeName at System.IO.Pipes.NamedPipeClientStream..ctor(String serverName, String pipeName, PipeDirection direction, PipeOptions options, TokenImpersonationLevel impersonationLevel, HandleInheritability inheritability) at System.IO.Pipes.NamedPipeClientStream..ctor(String pipeName) at ArtOfTest.WebAii.Messaging.Process.BrowserProvisioner.EndService() at ArtOfTest.WebAii.Core.Manager.End() at ArtOfTest.WebAii.Core.Manager.Dispose(Boolean disposing) at ArtOfTest.WebAii.Core.Manager.Dispose() at ArtOfTest.WebAii.Design.Execution.TestExecuteProxy.ExecuteTest(ExecuteTestCommand command) at ArtOfTest.WebAii.Design.Execution.ExecutionEngine.ExecuteTest(ExecuteTestCommand command) ------------------------------------------------------------