Problem creating connection to SQL Server


I am having trouble creating a connection to an SQL Server database. I have tried both LinqPad 4 and 5. Sometimes when I try to "test" the connection I get "The 'DbProviderFactories' section can only appear once per config file." Most of the time I get "Unable to find the requested .Net Framework Data Provider. It may not be installed."

I have many versions of the .NET Framework installed including 4, 4.5, 4.51, 4.5.2, 4.6, 4.6.1, 4.6.2.

Any ideas would be appreciated.


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