问could not find funcion "dplyr"？

命名已经老老实实加载了各个包，还会报错“could not find function "dplyr"”呢

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library(tidyverse)

library(dplyr)

library(reshape2)

head(ob1)

ob1

ob_mel <- melt(ob1, id=c("factor_W","factor_N"));head(ob_mel)

ob_dd <- dplyr(ob_mel,c("variable"),

              lm1 = aov(value~factor_W*factor_N),

              sum1 = summary(lm1)$coefficients,

              summarise)