I get the following error . I have seen this error in many blogs . I have followed followed folowing steps

1) Upgrade from 7.0 to 7.5 in deployemnet centre.

2) Upgrade the addon after product Upgrade.

Any have faces similar issue?

[ReflectionTypeLoadException: Unable to load one or more of the requested types. The following information may be a subset of the Type/LoaderException information present - inspect with debugger for complete view.
 Check assemblies [EPiServer.Shell.UI, Version=1.0.456.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7] and/or types [EPiServer.Shell.UI.Default,
 EPiServer.Shell.UI.InitializationModule,
 EPiServer.Shell.UI.Bootstrapper,
 EPiServer.Shell.UI.Controllers.EPiLicensingController,
 EPiServer.Shell.UI.Controllers.EPiDashboardController,
 EPiServer.Shell.UI.Controllers.EPiMetadataManagerController,
 EPiServer.Shell.UI.Controllers.EPiAboutController,
 EPiServer.Shell.UI.Controllers.EPiDebugController,
 EPiServer.Shell.UI.Controllers.FileVersionMetaData,
 EPiServer.Shell.UI.Controllers.EPiSettingsController,
 EPiServer.Shell.UI.Controllers.EPiResourcesController,
 EPiServer.Shell.UI.Controllers.EPiSearchController,
 EPiServer.Shell.UI.Controllers.VisitorGroupsStatisticsController,
 EPiServer.Shell.UI.Help,
 EPiServer.Shell.UI.Models.ComponentColumnDefinition,
 EPiServer.Shell.UI.Models.GroupSettingsViewModel,
 EPiServer.Shell.UI.Models.MetadataViewModel,
 EPiServer.Shell.UI.Rest.ComponentCategoryStore,
 EPiServer.Shell.UI.Rest.ComponentDefinitionStore,
 EPiServer.Shell.UI.Rest.ComponentSortOrderStore]. Information from LoaderExceptions property [Method 'get_DefaultContext' in type 'EPiServer.Shell.UI.Models.DashboardViewModel' from assembly 'EPiServer.Shell.UI, Version=1.0.456.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7' does not have an implementation.].]
   EPiServer.Framework.Initialization.InitializationModule.Initialize(HostType hostType) +811
   EPiServer.Framework.Initialization.InitializationModule.FrameworkInitialization(HostType hostType) +93
   EPiServer.Global..ctor() +104
   EPiServer.Templates.Global..ctor() +40
   ASP.global_asax..ctor() in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\8050e3d9\cbd8cef0\App_global.asax.0.cs:0

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0
   System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +159
   System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +256
   System.Activator.CreateInstance(Type type, Boolean nonPublic) +127
   System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark) +14259449
   System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +200
   System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture) +28
   System.Web.HttpRuntime.CreateNonPublicInstance(Type type, Object[] args) +83
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +312
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +475

[HttpException (0x80004005): Exception has been thrown by the target of an invocation.]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +12968436
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +159
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +12808141