Exception Lof

gistfile1.txt

SetUp : System.Exception : Instruments failed to start the app.
Stack trace:
  at Xamarin.UITest.iOS.Instruments.WaitForInstruments (Xamarin.UITest.Shared.Processes.RunningProcess instrumentsProcess) [0x00000] in <filename unknown>:0 
  at Xamarin.UITest.iOS.Instruments.StartInstrumentsInternal (System.String targetApplication, iOSRunType runType, System.String deviceId, System.String runLoopPath, AppDataMode appDataMode, System.Predicate`1 dropLine) [0x00000] in <filename unknown>:0 
  at Xamarin.UITest.iOS.Instruments.StartInstrumentsHostLoop (System.String targetApplication, iOSRunType runType, System.String deviceId, System.String fifoPath, AppDataMode appDataMode) [0x00000] in <filename unknown>:0 
  at Xamarin.UITest.iOS.iOSAppLauncher.RunAppLocalDevice (Xamarin.UITest.Shared.iOS.Queries.DeviceInfo deviceInfo, System.String bundleId, Xamarin.UITest.iOS.Instruments instruments, Xamarin.UITest.Shared.Http.HttpClient httpClient, System.Uri deviceUri, Xamarin.UITest.Shared.Artifacts.ArtifactFolder artifactFolder, AppDataMode appDataMode) [0x00000] in <filename unknown>:0 
  at Xamarin.UITest.iOS.iOSAppLauncher.LaunchApp (IiOSAppConfiguration appConfiguration, Xamarin.UITest.Shared.Http.HttpClient httpClient, Xamarin.UITest.TestCloud.TestCloudiOSAppConfiguration testCloudAppConfiguration, Xamarin.UITest.Shared.Http.HttpClient testCloudWsClient) [0x00000] in <filename unknown>:0 
  at Xamarin.UITest.iOS.iOSApp..ctor (IiOSAppConfiguration appConfiguration) [0x00000] in <filename unknown>:0 
  at Xamarin.UITest.Configuration.iOSAppConfigurator.StartApp (AppDataMode appDataMode) [0x00000] in <filename unknown>:0 
  at WebTest1.UITests.Tests.BeforeEachTest () [0x00026] in /Users/ixamarin78/Downloads/UITest-master/WebTest1.UITests/Tests.cs:26 
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00054] in /private/tmp/source-mono-mac-4.0.0-branch-c5sr2/bockbuild-mono-4.0.0-branch/profiles/mono-mac-xamarin/build-root/mono-4.0.2/mcs/class/corlib/System.Reflection/MonoMethod.cs:230