2014-03-31 15:35:13,544 [salt.log.setup   ][ERROR   ] An un-handled exception was caught by salt's global exception handler:
UnpackValueError: Data is not enough.
Traceback (most recent call last):
  File "<string>", line 6, in <module>
  File "__main__.py", line 726, in <module>
  File "__main__.py", line 332, in bootstrap
  File "__main__.py", line 359, in chainload
  File "__main__.py", line 715, in _chainload
  File "__main__.py", line 128, in <module>
  File "__main__salt-minion__.py", line 17, in <module>
  File "salt/scripts.py", line 35, in salt_minion
  File "salt/__init__.py", line 221, in start
  File "salt/__init__.py", line 209, in prepare
  File "salt/minion.py", line 543, in __init__
  File "salt/utils/schedule.py", line 73, in __init__
  File "salt/utils/schedule.py", line 265, in clean_proc_dir
  File "salt/payload.py", line 108, in load
  File "salt/payload.py", line 95, in loads
  File "msgpack/fallback.py", line 95, in unpackb
UnpackValueError: Data is not enough.