Hi R - listers,

I am receiving an error. Does anyone know what this means? J

ggplot(subset(foo, Rayos != "Rayos.NA"), aes(x=HTL, y=DevelopIndex,
colour=TotalEggs)) +geom_point() +geom_jitter() +  
facet_grid(Aeventexhumed ~ Rayos)
+ geom_smooth(method="lm", fill=NA) + ylim(c(0, 7))


Error in +geom_smooth(method = "lm", fill = NA) :
   invalid argument to unary operator
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