[R] Another question on gplot

[RON70]

I am getting following strange error :

library(sn)
library(ggplot2)

dat1 <- as.matrix(rsn(1000, 0, 1, 0))[,1]

ggplot() + geom_histogram(aes(x = dat1, y = ..density.., fill = ..count..))
+
              xlab("Distribution") + scale_y_continuous("") 


Error: No data for layer

Can anyone please tell me why it is coming?
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