title: Error in UseMethod: no applicable method for 'select_' applied to an object of class "function"
body: <p>I built a Shiny App. <strike>It runs fine locally, but when run using shinyapps.io,</strike> I get this error in the shinyapps.io log: Error in UseMethod: no applicable method for 'select_' applied to an object of class "function".</p>
  
  <p>I use select quite a bit. Here are some examples</p>
  
  <pre><code>output$columns &lt;- renderUI({
          req(input$df_input)
          df_input = read.csv(input$df_input$datapath,
                              header = T)
          df_unk_only = select(df_input, contains("ca"), contains("uzn"))
          selectInput("unknown", "Select unk:", choices = colnames(df_unk_only))
  
  df_input = read.csv(input$df_input$datapath, header = T)
  
          unknown &lt;- df_input %&gt;% select(input$unknown)
  
          miles &lt;- df %&gt;% select(starts_with("mi"))
  </code></pre>
  
  <p>Another related topic said that a package might mask the select function? I'm using these. I changed library to require to see if that was the issue. it wasn't.
  require(tidyr)
  require(dplyr)
  require(psych)
  require(data.table)
  require(ggplot2)
  require(plotly)
  require(DT)</p>
  
  <p>edit: nevermind, the app no longer runs fine locally. i'm not sure how I ran it so many times before.</p>