Error message after rebuild index

Question

I have a content type consiting out of two fields "First" and "Second". Then I said "Include in Index". After going to the settings and clicking "Rebuild Index" the following message occurs: (I am using SQL Express with Orchard 1.8.1)

Oops. Something went wrong ... sorry

An unhandled exception has occurred and the request was terminated. Please refresh the page. If the error persists, go back Access to the path 'segments.gen' is denied. System.UnauthorizedAccessException: Access to the path 'segments.gen' is denied. at System.IO.Directory.DeleteHelper(String fullPath, String userPath, Boolean recursive, Boolean throwOnTopLevelDirectoryNotFound) at System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive, Boolean checkHost) at Orchard.Indexing.Services.IndexingTaskExecutor.DeleteIndex(String indexName) at Orchard.Indexing.Services.IndexingTaskExecutor.RebuildIndex(String indexName) at Orchard.Indexing.Services.IndexingService.RebuildIndex(String indexName) at Orchard.Indexing.Controllers.AdminController.Rebuild(String id) at lambda_method(Closure , ControllerBase , Object[] ) at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary2 parameters) at System.Web.Mvc.Async.AsyncControllerActionInvoker.b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.b__3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass48.b__41() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass48.b__41() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass48.b__41()

The search settings page is empty now:

Answer 1

After changing the folder permissions for Orchard.Web\App_Data\Sites\Default\Indexes\Search and C:\inetpub\wwwroot\Orchard1\App_Data\Sites\Default it worked. I have to installations one on my development and the other on the test machine. So when I setup everything in Visual Studio somethimes folder permissions are not yet correct after publishing to the other system. I just changed IIS_IUSRS to have full access to these folders.