Couldn't find type for class Microsoft.WindowsAzure.Diagnostics
azure, azure-diagnostics, c#, newrelic
Solution
If you aren't running in the emulator, then see my SO answer here - How to solve Windows Azure Diagnostic Runtime Error (Could not create WindowsAzure.Diagnostics, Version=xx, Culture=neutral, PublicKeyToken=xx. Basically, just add:
<filter level="TraceEventType.Error" />
in the `<listeners><add>` section.
Problem
Just got back from holidays, and went in to make a couple small changes in our app, when I was confronted by this error: Couldn't find type for class Microsoft.WindowsAzure.Diagnostics.DiagnosticMonitorTraceListener, Microsoft.WindowsAzure.Diagnostics, Version=2.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35. The code had been running perfectly prior to coming back from holidays. It was last published to Azure 3 weeks ago, and it is now having the same issue there. Locally I attempted to fix it by removing add adding the following config section back: ``` <system.diagnostics> <trace> <listeners> <add type="Microsoft.WindowsAzure.Diagnostics.DiagnosticMonitorTraceListener, Microsoft.WindowsAzure.Diagnostics, Version=2.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" name="AzureDiagnostics"> </add> </listeners> </trace> </system.diagnostics> ``` Add adding and removing the Reference to the assembly: When I debug the project locally, Visual Studio breaks on the following line: ``` NewRelic.Api.Agent.NewRelic.IgnoreTransaction(); ``` This had been working both locally and in production until 2 days ago (according to the error log). Full Stack Trace: ``` [ConfigurationErrorsException: Couldn't find type for class Microsoft.WindowsAzure.Diagnostics.DiagnosticMonitorTraceListener, Microsoft.WindowsAzure.Diagnostics, Version=2.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35.] System.Diagnostics.TraceUtils.GetRuntimeObject(String className, Type baseType, String initializeData) +6755367 System.Diagnostics.TypedElement.BaseGetRuntimeObject() +45 System.Diagnostics.ListenerElement.GetRuntimeObject() +83 System.Diagnostics.ListenerElementsCollection.GetRuntimeObject() +143 System.Diagnostics.TraceInternal.get_Listeners() +181 System.Diagnostics.TraceInternal.WriteLine(String message) +119 System.Diagnostics.Trace.WriteLine(String message) +4 NewRelic.Api.Agent.NewRelic.IgnoreTransaction() +13 Linklicious2.Controllers.ApiController.GetLinksToPing(Boolean test) +46 lambda_method(Closure , ControllerBase , Object[] ) +98 System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +14 System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +214 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27 System.Web.Mvc.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() +55 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +253 System.Web.Mvc.<>c__DisplayClass17.<InvokeActionMethodWithFilters>b__14() +21 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +191 System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +324 System.Web.Mvc.Controller.ExecuteCore() +106 System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +91 System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10 System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +34 System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +19 System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +10 System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62 System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +48 System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7 System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +22 System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +60 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9631764 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155 ```