Hi there

I am a bit of a novis and been using Umbraco for a while and enjoying it. I tried to instal a version of contour however since my DB was mySQL I think this casused problems. Everything seemed to be ok but I have gone in to the site today and I am getting an error on the back end. Everything in the front end seems to be working fine - it is only after logging into Umbraco that I get this error:

Could not load type 'Umbraco.Web.WebApi.UmbracoApiController' from assembly 'umbraco, Version=1.0.4869.17901, Culture=neutral, PublicKeyToken=null'.

The Stack Trace is below - I really don't know too much about all the .net stuff which is why I liked umbraco so much so it has taken me out of my depth. Any pointers would be very much appreciated.

[TypeLoadException: Could not load type 'Umbraco.Web.WebApi.UmbracoApiController' from assembly 'umbraco, Version=1.0.4869.17901, Culture=neutral, PublicKeyToken=null'.]
   System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes) +0
   System.Reflection.RuntimeAssembly.GetExportedTypes() +38
   Umbraco.Core.TypeFinder.GetTypesWithFormattedException(Assembly a) +42
   Umbraco.Core.TypeFinder.GetTypes(Type assignTypeFrom, IEnumerable`1 assemblies, Boolean onlyConcreteClasses) +134
   Umbraco.Core.TypeFinder.GetAssignablesFromType(IEnumerable`1 assemblies, Boolean onlyConcreteClasses) +63
   Umbraco.Core.TypeFinder.FindClassesOfType(IEnumerable`1 assemblies, Boolean onlyConcreteClasses) +59
   umbraco.BusinessLogic.Actions.Action.<ReRegisterActionsAndHandlers>b__1() +35
   Umbraco.Core.ObjectResolution.LazyManyObjectsResolverBase`2.<get_InstanceTypes>b__5(Func`1 x) +7
   System.Linq.<SelectManyIterator>d__14`2.MoveNext() +238
   System.Linq.Buffer`1..ctor(IEnumerable`1 source) +217
   System.Linq.Enumerable.ToArray(IEnumerable`1 source) +78
   Umbraco.Core.ObjectResolution.LazyManyObjectsResolverBase`2.get_InstanceTypes() +626
   Umbraco.Core.ActionsResolver.CreateInstances() +69
   Umbraco.Core.ObjectResolution.ManyObjectsResolverBase`2.get_Values() +569
   umbraco.BusinessLogic.Actions.Action.GetJavaScriptFileReferences() +22
   umbraco.cms.presentation._umbraco.RenderActionJS() +43
   umbraco.cms.presentation._umbraco.Page_Load(Object sender, EventArgs e) +1824
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   umbraco.BasePages.BasePage.OnLoad(EventArgs e) +14
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207