!ERROR=21 - Invalid Line Number/Label

  • Using a line number outside the range 1..65534.

  • Attempting to edit a nonexistent line.

  • Attempting to delete a nonexistent line by typing the line number in console mode.

  • Attempting to append to a nonexistent line by using the colon (:) feature in console mode.

  • Referencing to a nonexistent line label.

  • The callback subroutine registered to handle an event is invalid.

See Also

List of Errors