Error running a command. cmd = /usr/sbin/btrfs qgroup assign 0/260 2015/12 /mnt2/Data-Disk. rc = 1. stdout = ['']. stderr = ['ERROR: unable to assign quota group: File exists', '']

There was a short thread some time ago with a similar symptom:

Were you trying to resize a share or during which action did this error occur?

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