使用R分析数据时，报错提示：Error in plot.crosspred(pred.O, "slices", var = O95, col = 2, cex.axis = 1.2, :
'var' must match values used for prediction。想请问是为什么，怎么解决，谢谢！
源代码为 plot(pred.O,
"slices",
var = O95,
col=2,
cex.axis=1.2,
xlab="lay(day)",
ylab="RR",
main=expression(P5),
cex.main=1.5,
type="p",
pch=19,
ci="bars")
