R GG仅绘制5个图中的1个，然后出错

我在尝试绘制dat数据帧时遇到以下错误

library(GGally)
library(ggplot2)
dat = data.frame(a=rnorm(5) , b= rnorm(5) ,c =rnorm(5) , d=rnorm(5) , e= c(1,2,3,4,5))
dat

           a          b          c           d e
1  0.21444531  1.9972134  2.1988103 -0.47624689 1
2 -0.32468591  0.6007088  1.3124130 -0.78860284 2
3  0.09458353 -1.2512714 -0.2651451 -0.59461727 3
4 -0.89536336 -0.6111659  0.5431941  1.65090747 4
5 -1.31080153 -1.1854801 -0.4143399 -0.05402813 5

ggpairs(dat  ,mapping=aes(color =e),upper=list(continuous=wrap("cor",size=2)), columns = c("a","b","c","d"))

错误：

---

$中的错误如果将

e

分解，则它将运行：

dat$e <- factor(dat$e)
ggpairs(dat,mapping=aes(color=e),upper=list(continuous=wrap("cor",size=2)), columns = c("a","b","c","d"))

---

如果将

e

分解，则它将运行：

dat$e <- factor(dat$e)
ggpairs(dat,mapping=aes(color=e),upper=list(continuous=wrap("cor",size=2)), columns = c("a","b","c","d"))