Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.

[Craig Wallace]

Hi,

I am getting this error about 75% of the time when running my project in VS 2010.  This seems to be since upgrading to version 2010.2.929.40.  This is now getting in the way of speedy development and debugging.

The full error is:

[ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.] System.Reflection.RuntimeModule.GetTypes(RuntimeModule module) +0 System.Reflection.RuntimeModule.GetTypes() +4 System.Reflection.Assembly.GetTypes() +78 System.Data.Metadata.Edm.ObjectItemConventionAssemblyLoader.LoadTypesFromAssembly() +32 System.Data.Metadata.Edm.ObjectItemAssemblyLoader.Load() +25 System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boolean loadReferencedAssemblies, ObjectItemLoadingSessionData loadingData) +160 System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boolean loadReferencedAssemblies, KnownAssembliesSet knownAssemblies, EdmItemCollection edmItemCollection, Action`1 logLoadMessage, Object& loaderCookie, Dictionary`2& typesInLoading, List`1& errors) +166 System.Data.Metadata.Edm.ObjectItemCollection.LoadAssemblyFromCache(ObjectItemCollection objectItemCollection, Assembly assembly, Boolean loadReferencedAssemblies, EdmItemCollection edmItemCollection, Action`1 logLoadMessage) +316 System.Data.Metadata.Edm.ObjectItemCollection.ExplicitLoadFromAssembly(Assembly assembly, EdmItemCollection edmItemCollection, Action`1 logLoadMessage) +53 System.Data.Metadata.Edm.MetadataWorkspace.ExplicitLoadFromAssembly(Assembly assembly, ObjectItemCollection collection, Action`1 logLoadMessage) +93 System.Data.Metadata.Edm.MetadataWorkspace.LoadFromAssembly(Assembly assembly, Action`1 logLoadMessage) +130 System.Web.UI.WebControls.EntityDataSourceView.ConstructContext() +585 System.Web.UI.WebControls.EntityDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +76 System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +21 Telerik.Web.UI.RadComboBox.OnDataBinding(EventArgs e) +1256 Telerik.Web.UI.RadComboBox.PerformSelect() +37 System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +74 Telerik.Web.UI.RadComboBox.DataBind() +70 System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +66 System.Web.UI.WebControls.BaseDataBoundControl.OnPreRender(EventArgs e) +22 Telerik.Web.UI.RadDataBoundControl.OnPreRender(EventArgs e) +36 Telerik.Web.UI.RadComboBox.OnPreRender(EventArgs e) +46 System.Web.UI.Control.PreRenderRecursiveInternal() +103 System.Web.UI.Control.PreRenderRecursiveInternal() +175 System.Web.UI.Control.PreRenderRecursiveInternal() +175 System.Web.UI.Control.PreRenderRecursiveInternal() +175 System.Web.UI.Control.PreRenderRecursiveInternal() +175 System.Web.UI.Control.PreRenderRecursiveInternal() +175 System.Web.UI.Control.PreRenderRecursiveInternal() +175 System.Web.UI.Control.PreRenderRecursiveInternal() +175 System.Web.UI.Control.PreRenderRecursiveInternal() +175 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2496

This could be an Entity Framework error, but seems to have started happening around the time of the upgrade.  Can you confirm for me whether it is EF or the RadComboBox?

Thanks.

[Craig Wallace]

This seems to have been caused by having an old reference or copy of a telerik assembly either referenced or in the bin folder.  I removed all Telerik references and cleared the files from bin and it went away.  This was after a recent update of the Telerik version.

[Harry]

Thanks Craig. 

I had a similar issue after recent Telerik upgrade. 

Harry

[Dan]

Take a look at this post on Microsoft Connect: http://connect.microsoft.com/VisualStudio/feedback/details/541962/unable-to-load-one-or-more-of-the-requested-types-connected-with-entitydatasource

What worked for me was adding ContectTypeName to the EntityDataSource. For example, ContextTypeName="CMRPemployees.Data_Access.dbCMRP_EmployeesEntities" 

Dan