Unable to find the requested .Net Framework Data Provider. It may not be installed. (Strategy type ConfiguredObjectStrategy, index 2)

We have a .Net web application using Oracle ODAC. When I deploy it, on certain servers I get

The current build operation (build key Build Key[Microsoft.Practices.EnterpriseLibrary.Data.Database,xxxxx]) failed:
Unable to find the requested .Net Framework Data Provider. It may not be installed. (Strategy type ConfiguredObjectStrategy, index 2)

xxxxx -> Stands for your db connection string.

I copied the following section from machine.config to my applications web.config, and that fixed it.

 C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config

 

Web.Config