[R] Error Message Cannot use `+.gg()` with a single argument. Did you accidentally put + on a new line?

[Rosato, Kyle]

For some simple reason, I am unable to see the mistake:

ggplot(filter(nlsw88, !(is.na(union))), aes(y = wage, x = union, fill = union))
+ geom_boxplot() + facet_wrap(~idblack)

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