[R] Error in Q-Q plot

[Megh Dal]

Hi,

I am trying to draw a Q-Q plot, however got following error.

> library(sn)
> library(car)
> dat1 = rst(1000, 0, 1, 0, 2)
> qq.plot(dat1, "st", 0, 1, 0, 9)
Error in plot.window(...) : 
  invalid value specified for graphical parameter "las"
Can anyone please tell me why this error is coming?