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shinyApp command in shiny package?

I have installed shiny in RStudio running R 2.15.3. I load the package by library(shiny) But when I try to use shinyApp command I'll get the following

library(shiny)
ui <- fluidPage()
server <- function(input,output){}
shinyApp(ui=ui,server=server)

Error: could not find function "shinyApp"

And even when I'm trying to use R help by :

?shinyApp

the answer is :

No documentation for ‘shinyApp’ in specified packages and libraries:
you could try ‘??shinyApp’

And it is very disappointing because this command is one of the essential commands that you need all time !

I have to mention that the sample code I have tried to compile, is from official tutorial by shiny (shiny.rstudio.com/tutorial) ! So basically it should work.

Can somebody help me on this please !

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shinyApp command in shiny package?

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