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When i trying change user group images aur Additional images have the following error see the below screen shots :

I don't know for sure whether this will help you.
In the AdminCP go to Users & Groups, then choose Groups and start editing the group you are dealing with. Somewhere near the bottom of tab General you find the checkbox as shown below:

[attachment=33584]

When this box is checked the users can choose this as their display group.

Problem Solved .