Function/ scripts can not be deleted

Function/ scripts can not be deleted

Hi
I have some scripts can not be deleted. And it cause the function call these scripts did not worked too.
These other scripts I can delete
Could you give me your solution about it?
My zenone editor is 6.50
Thanks and regards

This is a migrated post! Originally posted on 22.01.2016 by user skywalker. Please be aware that information can be outdated.