Invalid string option

This message occurs when Corona fails to identify and process text entered in string options field which can be found in Devel/Debug settings.

Syntax example:

type name = value


float mtlEditor.lightsIntensity = 2.5


Possible causes:

  • Typing error in entered string option
  • Entered string option was deprecated
  • Attempting to use string options in an incorrect way
  • Entered string option is only available in newer Corona versions


  • Make sure the string options are supposed to work in the version of Corona you are currently using
  • Make sure the string options are correctly written, including text formatting, spaces and special marks

See: String Options