[R] Error: could not find function "glht" (multcomp)

[BORGULYA Gábor]

Dear List,

Could you tell why I get the error message?

> library(multcomp)
> data("cholesterol")
> m = aov(response ~ trt, data = cholesterol)
> cht <- glht(m, linfct = mcp(trt = "Tukey"))
Error: could not find function "glht"

Thank you

Gábor