刚学clementine，碰到个问题，请各位帮忙。

stream 的截图在附件里，当我运行这个stream时，提示错误：

Time Series: One or more predictors have missing values. This can occur if historical data are incomplete, or if future values have not been specified in the Time Intervals node.

谁能告诉我为什么呢？
谢谢