Could you please try the following steps that might help resolving the issue:
- Verify that all necessary references are added: RadDateTimePicker requires two assemblies: Telerik.Windows.Controls.dll and Telerik.Windows.Controls.Input.dll. Please verify they are properly referenced.
- Make sure you have .NET version 4.0 or higher installed. Please note that .NET 4.0 is a minimum Development Environment requirement for our WPF suite.
- Cleaning and rebuilding the solution could sometimes resolve these kind of issues. Could you please try this as well if you haven't done this so far? You can try also to delete bin and obj folders of the project and rebuild.
If none of the above suggestions helps resolving the issue, we would appreciate if you send us a sample project, where the error appears so we could further investigate it on our side.
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