Mendix was working perfectly yesterday. I wanted to use Mendix today, but when I start Mendix 6.8.1 I get "An unknown error has occurred during the modeler startup. Please file a bug report containing the details of this error." I removed all the Mendix versions from my computer. Delteted all AppData folders, my windows cache/temp data. I reïnstalled Mendix and it still give me the same error. SimpleInjector.ActivationException: The registered delegate for type IMainForm threw an exception. The type initializer for 'System.ServiceModel.Channels.MessageVersion' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.ServiceModel.Channels.MessageVersion' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.ServiceModel.EnvelopeVersion' threw an exception. ---> System.BadImageFormatException: Could not load file or assembly 'SMDiagnostics, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. An attempt was made to load a program with an incorrect format. at System.Xml.XmlDictionaryString..ctor(IXmlDictionary dictionary, String value, Int32 key) at System.ServiceModel.Message11Dictionary..ctor(ServiceModelDictionary dictionary) at System.ServiceModel.XD.get_Message11Dictionary() at System.ServiceModel.EnvelopeVersion..cctor() --- End of inner exception stack trace --- at System.ServiceModel.Channels.MessageVersion..cctor() --- End of inner exception stack trace --- at System.ServiceModel.HttpBindingBase..ctor() at Mendix.Modeler.CloudConnector.CloudServiceImpl.CreateClient(String endpointAddress) in C:\jenkins \workspace\Modeler-Build\Mendix.Modeler.CloudConnector\CloudServiceImpl.cs:line 25 at Mendix.Modeler.CloudConnector.CloudServiceFactory.GetCloudService(String endpointAddress) in C:\jenkins \workspace\Modeler-Build\Mendix.Modeler.CloudConnector\CloudServiceFactory.cs:line 10 at Mendix.Modeler.WindowsGui.MainForm..ctor(IModelerGui _modelerGui, IGuiPluginManager guiPluginManager, ICloudDeployerFactory cloudDeployerFactory, ICloudServiceFactory cloudServiceFactory, IDocumentControlManager documentControlManager, IModelerSettingsManager modelerSettingsManager, IDashboardManager dashboardManager, ISignInManager signInManager, IApplicationManager applicationManager, IMenuBarViewModel menuBarViewModel, IEnumerable`1 dockableWindowProviders) in C:\jenkins\workspace\Modeler-Build\Mendix.Modeler.WindowsGui\MainForm.cs:line 114 at lambda_method(Closure ) at SimpleInjector.Lifestyles.SingletonLifestyle.SingletonLifestyleRegistrationBase`1.CreateInstanceWithNullCheck() at System.Lazy`1.CreateValue() at System.Lazy`1.LazyInitValue() at SimpleInjector.Lifestyles.SingletonLifestyle.SingletonLifestyleRegistrationBase`1.BuildExpression() at SimpleInjector.Registration.BuildExpression(InstanceProducer producer) at SimpleInjector.InstanceProducer.BuildExpressionInternal() at System.Lazy`1.CreateValue() at System.Lazy`1.LazyInitValue() at SimpleInjector.InstanceProducer.BuildInstanceCreator() at SimpleInjector.InstanceProducer.GetInstance() --- End of inner exception stack trace --- at SimpleInjector.InstanceProducer.GetInstance() at SimpleInjector.Container.GetInstance[TService]() at Mendix.Modeler.WindowsGui.App.InitModeler() in C:\jenkins\workspace\Modeler- Build\Mendix.Modeler.WindowsGui\App.xaml.cs:line 141