Can't install revolution slider

I can't install revolution slider,Visual composer and layer slider
When i try this appear:

Downloading installation package from http://api.muffingroup.com/plugins/download.php?code&plugin=revslider

Unpacking the package…

Warning: posix_getgrgid() has been disabled for security reasons in /home/whfurthe/public_html/wp-admin/includes/class-wp-filesystem-direct.php on line 227

Installing the plugin…

The package could not be installed. The plugin contains no files.

Plugin installation failed.

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