[问答] ggplot_smooth显示不出来，请教下大神 [推广有奖]

d <- ggplot(data=dc,aes(x=THTSLD, y=DV1))+
  geom_point(col="red")+
  geom_smooth( method="lm", col="black", fill="green",linetype=2)
d
#报错：geom_smooth()` using formula 'y ~ x'请问大神，这是怎么回事啊？为啥子一直报错呢？