RuntimeError: Triangulation is invalid

j'ai script Python, il a marché bien hier , mais aujourd’hui quand j'ai essayé de le compiler, il montre un message d'erreur

Code:

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 /usr/lib64/python2.7/site-packages/matplotlib/tri/triangulation.py:110: FutureWarning: comparison to `None` will result in an elementwise object comparison in the future.
  self._neighbors)
Traceback (most recent call last):
  File "mam2.py", line 72, in <module>
    zd[i].append(ml.griddata(cy[i][j],cx[i][j],ne[i][j], yd[i][j],xd[i][j], interp='linear'))
  File "/usr/lib64/python2.7/site-packages/matplotlib/mlab.py", line 3508, in griddata
    interpolator = LinearTriInterpolator(triang, z)
  File "/usr/lib64/python2.7/site-packages/matplotlib/tri/triinterpolate.py", line 268, in __init__
    TriInterpolator.__init__(self, triangulation, z, trifinder)
  File "/usr/lib64/python2.7/site-packages/matplotlib/tri/triinterpolate.py", line 50, in __init__
    self._trifinder = trifinder or self._triangulation.get_trifinder()
  File "/usr/lib64/python2.7/site-packages/matplotlib/tri/triangulation.py", line 177, in get_trifinder
    self._trifinder = TrapezoidMapTriFinder(self)
  File "/usr/lib64/python2.7/site-packages/matplotlib/tri/trifinder.py", line 44, in __init__
    self._initialize()
  File "/usr/lib64/python2.7/site-packages/matplotlib/tri/trifinder.py", line 81, in _initialize
    self._cpp_trifinder.initialize()
RuntimeError: Triangulation is invalid

merci d'avance