login error after installing contour

after installing contour the frontend of the site is fine but when i try to log in i get this error:

Server Error in '/' Application.

Could not load type 'Umbraco.Web.WebApi.UmbracoApiController' from assembly 'umbraco, Version=1.0.4898.17346, Culture=neutral, PublicKeyToken=null'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.TypeLoadException: Could not load type 'Umbraco.Web.WebApi.UmbracoApiController' from assembly 'umbraco, Version=1.0.4898.17346, Culture=neutral, PublicKeyToken=null'.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[TypeLoadException: Could not load type 'Umbraco.Web.WebApi.UmbracoApiController' from assembly 'umbraco, Version=1.0.4898.17346, Culture=neutral, PublicKeyToken=null'.]
   System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes) +0
   System.Reflection.RuntimeAssembly.GetExportedTypes() +122
   Umbraco.Core.TypeFinder.GetTypesWithFormattedException(Assembly a) +83
   Umbraco.Core.TypeFinder.GetClasses(Type assignTypeFrom, IEnumerable`1 assemblies, Boolean onlyConcreteClasses, Func`2 additionalFilter) +498
   Umbraco.Core.TypeFinder.GetClasses(Type assignTypeFrom, IEnumerable`1 assemblies, Boolean onlyConcreteClasses, Func`2 additionalFilter) +1293
   umbraco.BusinessLogic.Actions.Action.<ReRegisterActionsAndHandlers>b__1() +65
   Umbraco.Core.ObjectResolution.LazyManyObjectsResolverBase`2.<get_InstanceTypes>b__5(Func`1 x) +11
   System.Linq.<SelectManyIterator>d__14`2.MoveNext() +267
   System.Linq.Buffer`1..ctor(IEnumerable`1 source) +488
   System.Linq.Enumerable.ToArray(IEnumerable`1 source) +104
   Umbraco.Core.ObjectResolution.LazyManyObjectsResolverBase`2.get_InstanceTypes() +676
   Umbraco.Core.ActionsResolver.CreateInstances() +85
   Umbraco.Core.ObjectResolution.ManyObjectsResolverBase`2.get_Values() +678
   umbraco.BusinessLogic.Actions.Action.GetJavaScriptFileReferences() +32
   umbraco.cms.presentation._umbraco.RenderActionJS() +85
   umbraco.cms.presentation._umbraco.Page_Load(Object sender, EventArgs e) +1786
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
   umbraco.BasePages.BasePage.OnLoad(EventArgs e) +19
   System.Web.UI.Control.LoadRecursive() +71
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3048

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

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