joomla user selection modal (backend) not working, any idea? - joomla

I am working on joomla 2.5.8 version.
Everything is working fine, but i have a problem while loading user modal.
2.After clicking set user button this page will appear .
But, modal could not load :( and after clicking user, username couldn't fill on created by section.
i think following image make us clear. but it's not user modal it is menu modal.
what is the problem ?

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