Responsive Add Ons plugin won't install

Hi, when I try to install responsive add ons I receive this error:

object(WP_Error)#404 (2) { [“errors”]=> array(1) { [“plugins_api_failed”]=> array(1) { [0]=> string(219) “An unexpected error occurred. Something may be wrong with WordPress.org or this server’s configuration. If you continue to have problems, please try the support forums.” } } [“error_data”]=> array(1) { [“plugins_api_failed”]=> string(2) “N;” } }
Something went wrong with the plugin API.

How can I get this plugin to work!