我的df：
1994-02-04 1997-03-25 1999-06-30 2004-06-30 2015-12-17 mean min max
-20 -0.131310 -0.942392 -1.068188 -0.298004 -1.116645 -0.711308 -1.11664 -0.13131
-19 -0.072950 -0.653595 -1.009658 -0.398474 -0.561465 -0.539228 -1.00966 -0.0729501
-18 0.014590 -0.668795 -1.214516 -0.602820 -0.265169 -0.547342 -1.21452 0.01459
-17 -0.554421 -0.683995 -0.804800 -0.904230 -0.191844 -0.627858 -0.90423 -0.191844
-16 -0.175080 -0.075999 -1.653497 -0.650501 -0.241226 -0.559261 -1.6535 -0.0759994
-15 0.014590 0.273598 -1.521803 0.214563 -0.108043 -0.225419 -1.5218 0.273598
-14 0.000000 0.273598 -1.682763 -0.570465 0.228656 -0.350195 -1.68276 0.273598
我想绘制平均值，最小值和最大值，其中最小值和最大值之间的区域用阴影表示。我正在尝试......：
ax = df.plot(y=['min'],figsize=(12,8))
df['max'].plot(ax=ax)
df['mean'].plot(ax=ax)
ax.fill_between(df.index,df['max'],df['min'])
这给了我一张没有阴影和错误的图表：
TypeError: ufunc 'isfinite' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''
你知道哪里出错了吗？