cubicweb #822890 error when backuping (on upgrade) [resolved]

trace:

pg_dump -Fc --host=hercules --username=auc --no-owner --file /home/auc/etc/cubicweb.d/jplext/backup/tmpO_W_YS/system jplext
-> error trying to backup ldapuser [backup() takes exactly 2 arguments (3 given)]
prioritynormal
typebug
done in3.7.4
load0.100
load left0.000
closed by<not specified>