我在做《Python fo Data Analysis》第8章地震危机数据处理的时候出现了以下错误信息，希望有大神帮忙分析一下。
RuntimeError Traceback (most recent call last)
<ipython-input-15-b85854eb74f4> in <module>()
80 cat_data = data[data['category_%s' % code] == 1]
81
---> 82 x, y = m(cat_data.LONGITUDE, cat_data.LATITUDE)
83
84 m.plot(x, y, 'k.', alpha=0.5)
/usr/local/lib/python2.7/dist-packages/mpl_toolkits/basemap/__init__.pyc in __call__(self, x, y, inverse)
1146 except TypeError:
1147 y = [_dg2rad*yy for yy in y]
-> 1148 xout,yout = self.projtran(x,y,inverse=inverse)
1149 if self.celestial and inverse:
1150 try:
/usr/local/lib/python2.7/dist-packages/mpl_toolkits/basemap/proj.pyc in __call__(self, *args, **kw)
284 outxy = self._proj4(xy, inverse=inverse)
285 else:
--> 286 outx,outy = self._proj4(x, y, inverse=inverse)
287 if inverse:
288 if self.projection in ['merc','mill','gall']:
/usr/local/lib/python2.7/dist-packages/mpl_toolkits/basemap/pyproj.pyc in __call__(self, *args, **kw)
386 _proj.Proj._inv(self, inx, iny, radians=radians, errcheck=errcheck)
387 else:
--> 388 _proj.Proj._fwd(self, inx, iny, radians=radians, errcheck=errcheck)
389 # if inputs were lists, tuples or floats, convert back.
390 outx = _convertback(xisfloat,xislist,xistuple,inx)
_proj.pyx in _proj.Proj._fwd (src/_proj.c:1571)()
RuntimeError:
