Missing image when running shiny example from tutorial - r

Question

I am rather new in shiny, so I was running through some tutorials. However, I have a problem loading images from a file inside the "www" folder of the shiny app.
For example, when I run the code below, I get a missing image. However, if I refer to an image online, e.g., if I substitute "bigorb.png" by "http://shiny.rstudio.com/tutorial/lesson2/www/bigorb.png", I get the desired image without problems. I am using R version 3.3.1 on Windows 10. Can anyone help me?
ui <- shinyUI(fluidPage(
titlePanel("My Shiny App"),
sidebarLayout(
sidebarPanel(),
mainPanel(
img(src="bigorb.png", height = 400, width = 400)
)
)
))
server <- shinyServer(function(input, output) {
})
shinyApp(ui = ui, server = server)

Answer 1

This works for me:
Create folder /myApp
Inside /myApp: create a file starter.R with the following code, and make sure to set the working directory correctly:
library(shiny)
setwd("PATH_TO_myApp")
shiny::runApp("app")
In the folder /myApp, create a subfolder /app.
In /myApp/app/: create file "app.R" with your code from above.
Create another sub-subfolder /myApp/app/www/ . Include your image file.
Execute starter.R.
So your file list is:
/myApp/starter.R
/myApp/app/app.R
/myApp/app/www/bigorb.png