Thank you for writing.
Please refer to the following article where you can find the answer to your question: http://www.telerik.com/support/kb/details/failed-to-create-component-design-time-exception
I hope that you find this information useful. Should you have any other questions, do not hesitate to contact us.
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.