Hi guys,

I installed on v6.2RC and all looks good, web.config updated correctly and the UI displays OK.  Saved my first bundle but when I checked no CSS code is output for /bundles/core.  The log had the following:

2014-04-09 13:48:36,131 [9] ERROR Umbraco.Core.UmbracoApplicationBase - [Thread 30] An unhandled exception occurred

System.NullReferenceException: Object reference not set to an instance of an object.

   at Optimus.Umbraco.Trees.BundlingAndMinificationTree.<Render>b__2(XElement b)

   at System.Linq.EnumerableSorter`2.ComputeKeys(TElement[] elements, Int32 count)

   at System.Linq.EnumerableSorter`1.Sort(TElement[] elements, Int32 count)

   at System.Linq.OrderedEnumerable`1.<GetEnumerator>d__0.MoveNext()

   at Optimus.Umbraco.Trees.BundlingAndMinificationTree.Render(XmlTree& tree)

   at umbraco.presentation.webservices.TreeDataService.LoadTree(TreeRequestParams treeParams)

   at umbraco.presentation.webservices.TreeDataService.GetXmlTree()

   at umbraco.presentation.webservices.TreeDataService.ProcessRequest(HttpContext context)

   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

2014-04-09 13:48:36,307 [9] ERROR Umbraco.Core.UmbracoApplicationBase - [Thread 7] An unhandled exception occurred

System.NullReferenceException: Object reference not set to an instance of an object.

   at Optimus.Bundles.<>c__DisplayClass4.<GetBundleAsViewModel>b__1(XElement x)

   at System.Linq.Enumerable.Any[TSource](IEnumerable`1 source, Func`2 predicate)

   at Optimus.Bundles.GetBundleAsViewModel(String virtualPath, String bundleType)

   at Optimus.Controllers.BundleController.Index(String virtualPath, String bundleType)

   at lambda_method(Closure , ControllerBase , Object[] )

   at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)

   at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)

   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)

   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass13.<InvokeActionMethodWithFilters>b__10()

   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)

   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass13.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12()

   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)

   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass13.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12()

   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters)

   at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)

   at System.Web.Mvc.Controller.<>c__DisplayClass1d.<BeginExecuteCore>b__19()

   at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass1.<MakeVoidDelegate>b__0()

   at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _)

   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End()

   at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)

   at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar)

   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End()

   at System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult)

   at System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult)

   at System.Web.Mvc.MvcHandler.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult)

   at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar)

   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End()

   at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult)

   at System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result)

   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)