could you share what you've done to encounter this error? It seems you've created a custom control and added it on this page?
Grisha 'Greg' Karanikolov
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items