My SharePoint 2013 site stopped working today and cannot find the source of the issue. I wonder if anybody has the expertise to work out what the error below means or how I can go about trouble-shooting the issue.
The windows server was installing updates at the time but this may just be a coincidence and can not find any updates that may have caused a problem. Tried restarting services/iis/application pools but no luck. Central admin also does not load
Thanks
Server Error in '/' Application
Derived method 'RequiresWebPartClientScript' in type 'Microsoft.SharePoint.Taxonomy.TermProperty' from assembly 'Microsoft.SharePoint.Taxonomy, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' cannot reduce access
[TypeLoadException: Derived method 'RequiresWebPartClientScript' in type 'Microsoft.SharePoint.Taxonomy.TermProperty' from assembly 'Microsoft.SharePoint.Taxonomy, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' cannot reduce access.]
Microsoft.SharePoint.Publishing.Navigation.TaxonomyNavigationContext.EnsureCallbackInitialized() +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) +14297981
System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +198 System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture) +28
System.Web.HttpRuntime.CreateNonPublicInstance(Type type, Object[] args) +66
System.Web.HttpApplication.BuildIntegratedModuleCollection(List`1 moduleList) +309
System.Web.HttpApplication.GetModuleCollection(IntPtr appContext) +1227 System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +139
System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +322
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +384
System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +397[HttpException (0x80004005): Exception has been thrown by the target of an invocation.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +646
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +159 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +779