Can't Change Group Library Setting From "Private" to "Public, Closed"

I have four group bibliographies which I changed from "public, closed" to "private". After a time, I decided to change them back to "public, closed", again. The two smaller bibliographies worked fine. The other two, I can't get them out of "private". When I go to group settings and click on "library", one of the settings "no group file store" won't change and I get an error reading. Can anyone help!

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