Thank you for getting back to us.
Currently, you may try to perform the following steps:
1. Open your application and remove all Telerik's references.
2. Save the project and close it.
3. Open the project directory and delete "Bin" and "Obj" folders.
4. Open the project and add the references.
5. Build the application.
Do you get the same errors again?
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.