title: R shiny - image does not appear
body: <p>I am trying to insert a logo on my shiny page. </p>
  
  <p>Here is a reproducible example:</p>
  
  <p>app.R file:</p>
  
  <p><code>setwd(".../shinyApp")
  source("ui.R")
  source("server.R")
  shinyApp(ui, server)</code></p>
  
  <p>I use the runApp button to run the app</p>
  
  <p>ui.R file: </p>
  
  <p><code>ui &lt;- shinyUI(fluidPage(
  titlePanel("Blabla"),
    sidebarLayout(
      sidebarPanel(
        sliderInput(inputId="min",
                    label="Values",
                    min = 10, max = 100, value = 10,sep=" "),
                    h6("Done by:"),
                    img(src='logo.png',height=50,width=50)
        ),
      mainPanel(
        h1("Main title"),
        p("First paragraph"),
        h2("Subtitle"),
        p("Second paragraph"),
        tableOutput("table")
      )
    )))</code></p>
  
  <p>But this does not work ... I have a question mark error instead of my logo as if R could not find my image. The question mark is rightly located in my sidebarPanel though (and the text "Done by" appears).</p>
  
  <p>I have put my image in a www directory since I have read in many places that it was a solution (here for ex: <a href="https://stackoverflow.com/questions/38011285/image-not-showing-in-shiny-app-r">Image not showing in Shiny app R</a><a href="https://stackoverflow.com/questions/38011285/image-not-showing-in-shiny-app-r"></a>). </p>
  
  <p>My shiny app structure is the following : </p>
  
  <ul>
  <li><p>an app.R file: </p></li>
  <li><p>a shinyApp directory containing : my ui.R, my server.R and the www directory which contains my logo.png</p></li>
  </ul>
  
  <p>I have no idea what I have done wrong ... can anyone please help ? Many thanks ! </p>