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Exception Details: System.ArgumentException: Type "Telerik.Sitefinity.Samples.SimpleImageFieldElement, SitefinityWebApp" cannot be resolved.
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
[ArgumentException: Type "Telerik.Sitefinity.Samples.SimpleImageFieldElement, SitefinityWebApp" cannot be resolved.]
Telerik.Sitefinity.Configuration.ConfigElementDictionary`2.TryGetValueInternal(TKey key, TElement& element) +45
Telerik.Sitefinity.Web.UI.ContentUI.Config.ContentViewControlElement.TryGetView(String viewName, IContentViewDefinition& view) +31
Telerik.Sitefinity.Web.UI.ContentUI.ContentViewControlDefinition.TryGetView(String viewName, IContentViewDefinition& view) +131
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2496
The problem is caused by a custom field that you have added to the News module(Simple Image field). There is either missing file from the thumbnail selector control or some of the files is not being used properly. Can you confirm you have completed all steps from this blog post? Note the .js files have to be built as embedded resources and registered in AssemblyInfo.cs. Also make sure you build the project in visual studio when you have added all files, this way they will be accessible because building the project every time a change is made is required for web applications.
I suppose some of this steps will resolve the issue. If the problem persists write back.