class ActionView::WrongEncodingError

def initialize(string, encoding)
  @string, @encoding = string, encoding
end

def message
  @string.force_encoding(Encoding::ASCII_8BIT)
  "Your template was not saved as valid #{@encoding}. Please " \
  "either specify #{@encoding} as the encoding for your template " \
  "in your text editor, or mark the template with its " \
  "encoding by inserting the following as the first line " \
  "of the template:\n\n# encoding: <name of correct encoding>.\n\n" \
  "The source of your template was:\n\n#{@string}"
end