"Object reference not set to an instance of an object" when trying to install certificate

[osvaldolove]

Hi,

We've been using the 1.0.5 version of the extension with no issues for a while. One of our environments failed to auto-renew the certificate though so I upgraded to 1.0.6 of the Let's Encrypt extension.
When using the wizard and after clicking the Request and Install certificate button the following exception is raised - no settings have changed with this environment and has been working previously.

[NullReferenceException: Object reference not set to an instance of an object.]
   Certes.<>c.<NewOrder>b__19_0(Directory d) +0
   Certes.<GetResourceUri>d__0.MoveNext() +297
   System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +32
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
   Certes.<NewOrder>d__19.MoveNext() +373
   System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +32
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
   LetsEncrypt.Azure.Core.Services.<RequestCertificate>d__5.MoveNext() in D:\a\1\s\LetsEncrypt.SiteExtension.Core\Services\AcmeService.cs:53
   System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +32
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
   LetsEncrypt.Azure.Core.<RequestInternalAsync>d__14.MoveNext() in D:\a\1\s\LetsEncrypt.SiteExtension.Core\CertificateManager.cs:210
   System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +32
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
   LetsEncrypt.Azure.Core.<RequestAndInstallInternalAsync>d__15.MoveNext() in D:\a\1\s\LetsEncrypt.SiteExtension.Core\CertificateManager.cs:234
   System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +32
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
   LetsEncrypt.SiteExtension.Controllers.<Install>d__7.MoveNext() in D:\a\1\s\LetsEncrypt-SiteExtension\Controllers\HomeController.cs:271
   System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +32
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
   System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult) +92
   System.Web.Mvc.Async.<>c__DisplayClass8_0.<BeginInvokeAsynchronousActionMethod>b__1(IAsyncResult asyncResult) +22
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.<>c__DisplayClass11_0.<InvokeActionMethodFilterAsynchronouslyRecursive>b__0() +80
   System.Web.Mvc.Async.<>c__DisplayClass11_2.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2() +396
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.<>c__DisplayClass3_6.<BeginInvokeAction>b__4() +50
   System.Web.Mvc.Async.<>c__DisplayClass3_1.<BeginInvokeAction>b__1(IAsyncResult asyncResult) +188
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +38
   System.Web.Mvc.<>c.<BeginExecuteCore>b__152_1(IAsyncResult asyncResult, ExecuteCoreState innerState) +29
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +73
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +52
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +39
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +38
   System.Web.Mvc.<>c.<BeginProcessRequest>b__20_1(IAsyncResult asyncResult, ProcessRequestState innerState) +43
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +73
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +38
   System.Web.CallHandlerExecutionStep.InvokeEndHandler(IAsyncResult ar) +241
   System.Web.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar) +172

I have uninstalled, cleared out the App_Data/jobs folder and re-installed the extension but the above exception is still raised.

Let me know if you need any more details in order to debug.

Thanks.

[osvaldolove]

The extension is now working again, this seems to be a transient issue (perhaps a problem downstream).