You, ask a question: on a computer I use vs2017 as a little thing, you need to export to excel table of data in the database, the program is running normally, but I don't copy a source program to a new vs2017 computer installation, operation mistakes excel. Application error, I need to add references, this time I have Imports excel program.=the Microsoft Office. Interop. Excel reference, when I add the excel error 14.0 reference tip: failed to add the "Microsoft excel 14.0 object library" of the reference, in reference to this type library, add the type library must be removed before quoting ". Microsoft Office. Interop. Excel, "I will Imports excel=Microsoft Office. Interop. Excel after delete all still can't add to excel 14.0 library reference, great god, please give directions