error while installing plugin

I am getting error while trying to install plugins…

An unexpected error occurred. Something may be wrong with www.remarpro.com or this server’s configuration. If you continue to have problems, please try the support forums.

these are the plugins that are having problems:

This theme recommends the following plugins: JW Player for WordPress, TrueMAG – Movie, TrueMAG – Shortcodes, TrueMAG Rating and Truemag – Member.
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