ye any attachment and i want to do it based on usergroup so each usergroup will get differnt no permission message.
so what i have to edit language phrase or attachment template?

First, you need to find where the error message is posted from - is it in a template? I have no idea what message you are talking about, so I can't help at all with that. But, if you can find where it is coming from, I can help you out.

Do this..... get the error message to appear. Do what I posted above to put the template name in the source code and then find the template that is spitting out the error message. Let us know the template name. While you are at it, get an image of this error message you are talking about so I know what it is you are wanting to change.