I have installed via nuget into umbraco 7.7.1. Can rebuild index no problem. However when I do backoffice search I get the following error:

)]}', {"Message":"An error has occurred.","ExceptionMessage":"Could not load type 'Umbraco.Web.Models.ContentEditing.EntityTypeSearchResult' from assembly 'umbraco, Version=1.0.6471.23334, Culture=neutral, PublicKeyToken=null'.","ExceptionType":"System.TypeLoadException","StackTrace":" at System.Signature.GetSignature(Void* pCorSig, Int32 cCorSig, RuntimeFieldHandleInternal fieldHandle, IRuntimeMethodInfo methodHandle, RuntimeType declaringType)\r\n at System.Reflection.RuntimeMethodInfo.getReturnType()\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.GetReturnType(MethodInfo methodInfo)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.InitializeProperties(MethodInfo methodInfo)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor..ctor(HttpControllerDescriptor controllerDescriptor, MethodInfo methodInfo)\r\n at System.Web.Http.Controllers.ApiControllerActionSelector.ActionSelectorCacheItem..ctor(HttpControllerDescriptor controllerDescriptor)\r\n at System.Web.Http.Controllers.ApiControllerActionSelector.GetInternalSelector(HttpControllerDescriptor controllerDescriptor)\r\n at System.Web.Http.Controllers.ApiControllerActionSelector.SelectAction(HttpControllerContext controllerContext)\r\n at System.Web.Http.ApiController.ExecuteAsync(HttpControllerContext controllerContext, CancellationToken cancellationToken)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher._1.MoveNext()"}

Not sure if this due to this version of umbraco and ISearchableTree swapability?

Regards

Ismail