title: Unused argument error with offset in column() for Shiny
body: <p>Following is my server.R script:</p>
  
  <pre><code>shinyServer(function(input, output, session) {
  })
  </code></pre>
  
  <p>Following is my ui.R script:</p>
  
  <pre><code>library(shiny)
  library(shinythemes)
  
  
  shinyUI(navbarPage("My Electronic CV", theme = shinytheme('readable'), inverse = TRUE,
          tabPanel("Overview Section",
              fluidRow(
                  column(width = 4,
                      "4"
                  ),
                  column(width = 3, offset = 2,
                      "3 offset 2"
                  )
              ) #closing bracket for fluidRow
          ) #closing bracket for tabPanel
      ) #closing bracket for navbarPage
  ) #closing bracket for shinyUI
  </code></pre>
  
  <p>With the above scripts, I keep getting the error:</p>
  
  <pre><code>Error in column(width = 4, "4") : unused argument (width = 4)
  </code></pre>
  
  <p>But I am really confused why this is so - I have spent the last couple of hours trying to find out why I face this.
  Could anybody please point me in the right direction?</p>