>library(Rcmdr) #fails to load - r

I have tried the following steps:
install.packages("Rcmdr", dependencies=TRUE)
install.packages("knitr", dependencies=TRUE)
library(Rcmdr)
output for this step is below
Loading required package: RcmdrMisc
Error: package or namespace load failed for ‘RcmdrMisc’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
there is no package called ‘knitr’
Error: package ‘RcmdrMisc’ could not be loaded
I'm working in Rversion=3.4.1 & Rstudio=1.0.143

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