Xsan, Lion Server: Issues saving a file to an Xsan volume; "GSLibraryErrorDomain error 1" appears (Apple KB)

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In OS X Lion and Lion Server v10.7 through v10.7.2, if a file on a locally mounted Xsan volume has been edited by multiple users on different systems, you may see the following alert message when trying to save the file: "The operation couldn’t be completed. (GSLibraryErrorDomain error 1.)"

Read more: https://support.apple.com/en-us/HT200163