Thanks for contacting us.
The easiest way to get rid of this error is to attach the database to your SQL Server
using SQL Server Management Studio, create a new page, drop a SQL Datasource on it, configure the connection and swap the connection string name with the one from the TIU project.
I'd be happy to provide more info on how to accomplish these steps, so let us know if you need help.
All the best,
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.