I had similar issues on my setup when using IE11. Turned out it was dumping JavaScript error messages to the Console. Loading the site up using Chrome worked.

Ahh that did bring me further, google throws a 500 error: "POST http://localhost:57855/umbraco/backoffice/UmbracoApi/Authentication/PostLogin 500 (Internal Server Error)"

And the complete error is:

{"Message":"An error has occurred.","ExceptionMessage":"Entry point was not found.","ExceptionType":"System.EntryPointNotFoundException","StackTrace":"   at System.Collections.Generic.ICollection`1.Add(T item)\r\n   at Umbraco.Web.WebApi.Filters.OutgoingDateTimeFormatAttribute.Initialize(HttpControllerSettings controllerSettings, HttpControllerDescriptor controllerDescriptor)\r\n   at System.Web.Http.Controllers.HttpControllerDescriptor.InvokeAttributesOnControllerType(HttpControllerDescriptor controllerDescriptor, Type type)\r\n   at System.Web.Http.Controllers.HttpControllerDescriptor.InvokeAttributesOnControllerType(HttpControllerDescriptor controllerDescriptor, Type type)\r\n   at System.Web.Http.Controllers.HttpControllerDescriptor..ctor(HttpConfiguration configuration, String controllerName, Type controllerType)\r\n   at System.Web.Http.Dispatcher.DefaultHttpControllerSelector.InitializeControllerInfoCache()\r\n   at System.Lazy`1.CreateValue()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Lazy`1.get_Value()\r\n   at System.Web.Http.Dispatcher.DefaultHttpControllerSelector.GetControllerMapping()\r\n   at Umbraco.Web.WebApi.NamespaceHttpControllerSelector.SelectController(HttpRequestMessage request)\r\n   at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsyncInternal(HttpRequestMessage request, CancellationToken cancellationToken)\r\n   at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)"}

I ran the Nuget installer over the project and the upgrade seems to have mostly worked out. However, when trying to open a front end page I now get a reference error: " Compiler Error Message: CS0234: The type or namespace name 'Helpers' does not exist in the namespace 'Microsoft.Web' (are you missing an assembly reference?) "

Hi Dave,

It seems that you are missing a or some dll´s file in your bin folder. What you could try to do is download the files from https://our.umbraco.org/contribute/releases/ of the version of Umbraco that you are using.

And then unzip the file, and copy over the dll files from the bin directory into your bin folder of your Umbraco installation.

Hope this helps,

/Dennis

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