Kashidas cannot be applied except on text based on a font currently installed on the workstation.
If you do not want to use kashidas
If this message is occurring for text that to which kashidas are not meant to be applied, then make sure that the text, which is the source of the present message, does not use an H&J (hyphenation and justification) set whose name contains "Arabic" in it.
See also: Arabic at Design-Time.
Topic 181955, last updated on 27-Feb-2021