NameError: uninitialized constant FileUtils

Question

I tried to copy a file from my desktop to another folder with this code:

 FileUtils.cp('image.png', '/folder/image.png')

I got this error:

NameError: uninitialized constant FileUtils
Did you mean? FileTest

I am trying to work out why I got the error.

Answer 1

FileUtils must be explicitly required:

require 'fileutils'
FileUtils.cp('image.png', '/folder/image.png')