Can you confirm that you built the project and then tried to add the provider on this screen?
should be resolved to a type in your project, which will happen if your project was successfully built once.
Let us know if you have any other questions.
the Telerik team
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 Public Issue Tracking
system and vote to affect the priority of the items