Barman 2.3 errors

Hi,

I'm trying to backup a remote DB (9.6.6) using barman 2.3 but backup failed start.
In barman.log i've such errors :

2018-02-12 16:18:23,852 [57691] barman.server ERROR: Check 'replication slot' failed for server 'tcgepg96ddm'
2018-02-12 16:18:23,857 [57691] barman.server ERROR: Check 'receive-wal running' failed for server 'tcgepg96ddm'
2018-02-12 16:18:30,815 [57779] barman.wal_archiver INFO: No xlog segments found from streaming for tcgepg96ddm.
2018-02-12 16:18:30,824 [57781] barman.server INFO: Starting receive-wal for server tcgepg96ddm
2018-02-12 16:18:30,905 [57781] barman.wal_archiver INFO: Synchronous WAL streaming for barman_receive_wal: True
2018-02-12 16:18:30,906 [57781] barman.wal_archiver INFO: Activating WAL archiving through streaming protocol
2018-02-12 16:18:30,922 [57781] barman.cli ERROR: 'utf8' codec can't decode byte 0xe0 in position 47: invalid continuation byte
See log file for more details.
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/barman/cli.py", line 1126, in main
p.dispatch(pre_call=global_config)
File "/usr/lib/python2.7/site-packages/argh/helpers.py", line 55, in dispatch
return dispatch(self, *args, **kwargs)
File "/usr/lib/python2.7/site-packages/argh/dispatching.py", line 174, in dispatch
for line in lines:
File "/usr/lib/python2.7/site-packages/argh/dispatching.py", line 277, in _execute_command
for line in result:
File "/usr/lib/python2.7/site-packages/argh/dispatching.py", line 231, in _call
result = function(namespace_obj)
File "/usr/lib/python2.7/site-packages/barman/cli.py", line 792, in receive_wal
server.receive_wal(reset=args.reset)
File "/usr/lib/python2.7/site-packages/barman/server.py", line 1708, in receive_wal
archiver.receive_wal(reset)
File "/usr/lib/python2.7/site-packages/barman/wal_archiver.py", line 751, in receive_wal
receive.execute()
File "/usr/lib/python2.7/site-packages/barman/command_wrappers.py", line 418, in execute
self.pipe_processor_loop(processors)
File "/usr/lib/python2.7/site-packages/barman/command_wrappers.py", line 484, in pipe_processor_loop
eof = stream.process()
File "/usr/lib/python2.7/site-packages/barman/command_wrappers.py", line 82, in process
self._buf += data.decode('utf-8')
File "/usr/lib64/python2.7/encodings/utf_8.py", line 16, in decode
return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xe0 in position 47: invalid continuation byte
2018-02-12 16:18:32,373 [58491] barman.server ERROR: Check 'WAL archive' failed for server 'tcgepg96ddm'
2018-02-12 16:18:32,468 [58491] barman.wal_archiver INFO: Synchronous WAL streaming for barman_receive_wal: True
2018-02-12 16:18:32,485 [58491] barman.server ERROR: Check 'receive-wal running' failed for server 'tcgepg96ddm'

My remote Db server conf is :

[myclient]
conninfo = host=myclient user=barman dbname=dbclient
streaming_conninfo = host= myclient user=streaming_barman
backup_method = postgres
streaming_backup_name = barman_streaming_backup
streaming_archiver = on
slot_name = barman

A barman check gives :

$barman check tcgepg96ddm
Server tcgepg96ddm:
WAL archive: FAILED (please make sure WAL shipping is setup)
PostgreSQL: OK
is_superuser: OK
PostgreSQL streaming: OK
wal_level: OK
replication slot: OK
directories: OK
retention policy settings: OK
backup maximum age: OK (no last_backup_maximum_age provided)
compression settings: OK
failed backups: OK (there are 0 failed backups)
minimum redundancy requirements: OK (have 0 backups, expected at least 0)
pg_basebackup: OK
pg_basebackup compatible: OK
pg_basebackup supports tablespaces mapping: OK
pg_receivexlog: OK
pg_receivexlog compatible: OK
receive-wal running: FAILED (See the Barman log file for more details)
archiver errors: OK

Have you ever had same problem with barman ?
Thanks for you help.
nicolas