[DEBUG   ] Skipping /var/cache/salt/minion/extmods/returners, it is not a directory
[DEBUG   ] Loaded couchdb_return as virtual couchdb
[DEBUG   ] Loaded syslog_return as virtual syslog
[DEBUG   ] Loaded carbon_return as virtual carbon
[DEBUG   ] Loaded sqlite3_return as virtual sqlite3
[ERROR   ] An un-handled exception was caught by salt's global exception handler:
UnpackValueError:
Traceback (most recent call last):
  File "/usr/bin/salt-minion", line 14, in <module>
    salt_minion()
  File "/usr/lib/python2.7/dist-packages/salt/scripts.py", line 30, in salt_minion
    minion.start()
  File "/usr/lib/python2.7/dist-packages/salt/__init__.py", line 219, in start
    self.prepare()
  File "/usr/lib/python2.7/dist-packages/salt/__init__.py", line 207, in prepare
    self.minion = salt.minion.Minion(self.config)
  File "/usr/lib/python2.7/dist-packages/salt/minion.py", line 518, in __init__
    self.returners)
  File "/usr/lib/python2.7/dist-packages/salt/utils/schedule.py", line 71, in __init__
    clean_proc_dir(opts)
  File "/usr/lib/python2.7/dist-packages/salt/utils/schedule.py", line 267, in clean_proc_dir
    job = salt.payload.Serial(opts).load(fp_)
  File "/usr/lib/python2.7/dist-packages/salt/payload.py", line 108, in load
    return self.loads(data)
  File "/usr/lib/python2.7/dist-packages/salt/payload.py", line 95, in loads
    return msgpack.loads(msg, use_list=True)
  File "_unpacker.pyx", line 119, in msgpack._unpacker.unpackb (msgpack/_unpacker.cpp:119)
UnpackValueError
Traceback (most recent call last):
  File "/usr/bin/salt-minion", line 14, in <module>
    salt_minion()
  File "/usr/lib/python2.7/dist-packages/salt/scripts.py", line 30, in salt_minion
    minion.start()
  File "/usr/lib/python2.7/dist-packages/salt/__init__.py", line 219, in start
    self.prepare()
  File "/usr/lib/python2.7/dist-packages/salt/__init__.py", line 207, in prepare
    self.minion = salt.minion.Minion(self.config)
  File "/usr/lib/python2.7/dist-packages/salt/minion.py", line 518, in __init__
    self.returners)
  File "/usr/lib/python2.7/dist-packages/salt/utils/schedule.py", line 71, in __init__
    clean_proc_dir(opts)
  File "/usr/lib/python2.7/dist-packages/salt/utils/schedule.py", line 267, in clean_proc_dir
    job = salt.payload.Serial(opts).load(fp_)
  File "/usr/lib/python2.7/dist-packages/salt/payload.py", line 108, in load
    return self.loads(data)
  File "/usr/lib/python2.7/dist-packages/salt/payload.py", line 95, in loads
    return msgpack.loads(msg, use_list=True)
  File "_unpacker.pyx", line 119, in msgpack._unpacker.unpackb (msgpack/_unpacker.cpp:119)
msgpack.exceptions.UnpackValueError