I also get the same error when I try to change message areas
Also when I change file areas.
I am using the mpl bt-gasel for mesage areas and file area selection, which worked fine with the last update of a37 before you released final.
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--- Mystic BBS/NNTP v1.12 A37 2017/12/31 (Linux/64)
* Origin: -=The ByteXchange BBS : bbs.thebytexchange.com=- (21:1/107)