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Just for future poor souls who may be pulling their hair out over the same issue, I eventually got to the bottom of this cryptic error message.
Do not try to import all your fields at once if your group has over 63 of them, as it will fail.
If you use the Insert Table option, and try to put all the fields in at once, it will give you a more meaningful message, and the one it SHOULD have given you in the first place, which is "A table cannot contain more than 63 columns".
So - Import them, a few at a time. Then move them all into one group and you're good to go.