Displays the given error message in a new of the given width.
If close is true then an additional close button is added to the window.
The optional icon specifies the icon to be used for the window. Default
is Utils#errorImage.
Parameters
message: string
String specifying the message to be displayed.
width: number
Integer specifying the width of the window.
close: boolean
Optional boolean indicating whether to add a close button.
Displays the given error message in a new of the given width.
If close is true then an additional close button is added to the window.
The optional icon specifies the icon to be used for the window. Default
is Utils#errorImage.