Since the export and import are folder based, that error message is meaningless. You will need an empty folder (not a library, a completely empty folder to import the library too). You will also get your plugins and other bits and bobs so that may error out if you are importing into an existing calibre installation.
For my quick and dirty test, I exported one library to the Export Test directory and then imported it to an Import_Test directory. After the import, I added the Import_Test directory to calibre (use the Use the previously existing library at the new location option in the Switch/create library menu).
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