salt returner mysql

###################################################
MY /etc/salt/master.d/returner_salt.conf CONTAINS:
###################################################

mysql.host: 'XXX'
mysql.user: 'XXX'
mysql.pass: 'XXX'
mysql.db: 'XXX'
mysql.port: 3306

master_job_cache: mysql


###############################
salt my-host test.ping
returns to the console:


[CRITICAL] Could not deserialize msgpack message.This often happens when trying to read a file not in binary modeTo see message payload, enable debug logging and retry. Exception: unpack(b) received extra data.
[ERROR   ] Uncaught exception, closing connection.
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 414, in _run_callback
    callback(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/tornado/stack_context.py", line 274, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/salt/transport/zeromq.py", line 964, in mark_future
    data = self.serial.loads(msg[0])
  File "/usr/lib/python2.7/site-packages/salt/payload.py", line 137, in loads
    ret = msgpack.loads(msg, use_list=True, encoding=encoding)
  File "msgpack/_unpacker.pyx", line 143, in msgpack._unpacker.unpackb (msgpack/_unpacker.cpp:2143)
ExtraData: unpack(b) received extra data.
[ERROR   ] Uncaught exception, closing connection.
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 440, in _handle_events
    self._handle_recv()
  File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 472, in _handle_recv
    self._run_callback(callback, msg)
  File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 414, in _run_callback
    callback(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/tornado/stack_context.py", line 274, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/salt/transport/zeromq.py", line 964, in mark_future
    data = self.serial.loads(msg[0])
  File "/usr/lib/python2.7/site-packages/salt/payload.py", line 137, in loads
    ret = msgpack.loads(msg, use_list=True, encoding=encoding)
  File "msgpack/_unpacker.pyx", line 143, in msgpack._unpacker.unpackb (msgpack/_unpacker.cpp:2143)
ExtraData: unpack(b) received extra data.
[ERROR   ] Exception in callback None
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/tornado/ioloop.py", line 865, in start
    handler_func(fd_obj, events)
  File "/usr/lib64/python2.7/site-packages/tornado/stack_context.py", line 274, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 440, in _handle_events
    self._handle_recv()
  File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 472, in _handle_recv
    self._run_callback(callback, msg)
  File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 414, in _run_callback
    callback(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/tornado/stack_context.py", line 274, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/salt/transport/zeromq.py", line 964, in mark_future
    data = self.serial.loads(msg[0])
  File "/usr/lib/python2.7/site-packages/salt/payload.py", line 137, in loads
    ret = msgpack.loads(msg, use_list=True, encoding=encoding)
  File "msgpack/_unpacker.pyx", line 143, in msgpack._unpacker.unpackb (msgpack/_unpacker.cpp:2143)
ExtraData: unpack(b) received extra data.