[matplotlib-devel] 'Polygon' object has no attribute '_paths'

There is a problem on pylab ,WindowsTraceback (most recent call last):  File "....\basemap-0.9.5\examples\plot_tissot.py", line 59, in <module>    m.drawmapboundary()  File "C:\Python25\Lib\site-packages\matplotlib\toolkits\basemap\basemap.py", line 1227, in drawmapboundary    ax.add_collection(bound)  File "C:\Python25\Lib\site-packages\matplotlib\axes.py", line 1320, in add_collection    if collection._paths and len(collection._paths):AttributeError: 'Polygon' object has no attribute '_paths'