Compiler Error: User-defined types not defined

I had forgotten to add a reference to “Microsoft ActiveX Data Objects 2.5 Library”: This reference is required for early binding.

How to get to that reference:

Tools > References > Check the checkbox in front of “Microsoft ActiveX Data Objects 2.5 Library”

Other libraries that work include:

Microsoft ActiveX Data Objects 2.6 Library

Microsoft ActiveX Data Objects 2.7 Library

Microsoft ActiveX Data Objects 2.8 Library

Microsoft ActiveX Data Objects 6.1 Library

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