Imap : BAD parse error, invalid message sequence number

[iXo]

I am trying plakar for the first time and wanted to backup a zimbra (quite old version) imap account, it seems to have established the connection, as it shows me the right folder list, but on the first one, it shows a bunch of errors, and fails :

ca952dd2: KO ✘ /4tanaa/3846: scan error: imap: BAD parse error: invalid message sequence number: 3846 ca952dd2: KO ✘ /4tanaa/3848: scan error: imap: BAD parse error: invalid message sequence number: 3848 ca952dd2: KO ✘ /4tanaa/3850: scan error: imap: BAD parse error: invalid message sequence number: 3850 ca952dd2: KO ✘ /4tanaa/3852: scan error: imap: BAD parse error: invalid message sequence number: 3852 ca952dd2: KO ✘ /4tanaa/3854: scan error: imap: BAD parse error: invalid message sequence number: 3854 ca952dd2: KO ✘ /4tanaa/3864: scan error: write tcp 10.0.20.10:47332->10.0.100.1:143: use of closed network connection ca952dd2: KO ✘ /4tanaa/3856: scan error: unexpected EOF ca952dd2: KO ✘ /4tanaa/3874: scan error: write tcp 10.0.20.10:47332->10.0.100.1:143: use of closed network connection ca952dd2: KO ✘ /4tanaa/3860: scan error: write tcp 10.0.20.10:47332->10.0.100.1:143: use of closed network connection ca952dd2: KO ✘ /4tanaa/3858: scan error: write tcp 10.0.20.10:47332->10.0.100.1:143: use of closed network connection ca952dd2: KO ✘ /4tanaa/3876: scan error: write tcp 10.0.20.10:47332->10.0.100.1:143: use of closed network connection

I am using plakar v1.0.6 and imap addon v1.0.0-rc3, and Archlinux (but I doubt this is important here)