InvalidIndexError：（切片（无，无，无），无）

Question

我正在尝试使用以下代码 plot 过去的数据点：

forecast_object = results.get_forecast(steps=60)

# Extract prediction mean
mean = forecast_object.predicted_mean

# Extract the confidence intervals
conf_int = forecast_object.conf_int()

# Extract the forecast dates
dates = mean.index

plt.figure()

plt.plot(df.index, df, label='past')

# Plot the prediction means as line
plt.plot(dates, mean, label='predicted')

# Shade between the confidence intervals
plt.fill_between(dates, conf_int.iloc[:,0], conf_int.iloc[:,1], alpha=0.2)

# Plot legend and show figure
plt.legend()
plt.show()

但是我收到以下错误：

Input In [41], in <cell line: 15>()
     11 dates = mean.index
     13 plt.figure()
---> 15 plt.plot(X_train, df, label='past')
     17 # Plot the prediction means as line
     18 plt.plot(dates, mean, label='predicted')

InvalidIndexError: (slice(None, None, None), None)

我不确定我做错了什么。

这是我正在使用的数据：

数据