Not able to install "shiny"

I am trying to install "shiny" using rstudio, but getting the following error :

.Rprofile: Setting UK repositorynError: package or namespace load failed for ‘shiny’:
.onLoad failed in loadNamespace() for 'shiny', details:
call: .Call("_httpuv_getRNGState", PACKAGE = "httpuv")
error: "_httpuv_getRNGState" not available for .Call() for package "httpuv"
Error: loading failed
Execution halted

What to do? Please help. Finally I want to install "nonlinearTseries".

You may try to reinstall httpuv if not tried already.