2018-04-08 21:59:21,762 ERROR    root         cannot make last_few_vec plot
Traceback (most recent call last):
  File "/usr/local/currents/bin/run_lastfew_vec.py", line 107, in <module>
    LFV.stage_refls()
  File "/usr/local/lib/python2.7/dist-packages/pycurrents/adcp/plot_lastfew_vec.py", line 154, in stage_refls
    urefsm = Runstats(uref, self.avgwin).mean
  File "runstats.pyx", line 126, in runstats.Runstats.__init__ (num/src/runstats.c:2441)
  File "/usr/lib/python2.7/dist-packages/numpy/ma/core.py", line 3103, in astype
    if self._fill_value is not None:
AttributeError: 'MaskedConstant' object has no attribute '_fill_value'