wordpress安装插件“wordpress发生意外错误，可能WordPress.org

http://*.*.*.*/wp-admin/update.php?action=install-plugin&plugin=bbpress&_wpnonce=39e9668a43

} elseif ( 'install-plugin' == $action ) {
if ( ! current_user_can('install_plugins') )
wp_die( __( 'You do not have sufficient permissions to install plugins on this site.' ) );
include_once( ABSPATH . 'wp-admin/includes/plugin-install.php' ); //for plugins_api..
check_admin_referer( 'install-plugin_' . $plugin );
$api = plugins_api( 'plugin_information', array(
'slug' => $plugin,
'fields' => array(
'short_description' => false,
'sections' => false,
'requires' => false,
'rating' => false,
'ratings' => false,
'downloaded' => false,
'last_updated' => false,
'added' => false,
'tags' => false,
'compatibility' => false,
'homepage' => false,
'donate_link' => false,
),
) );

if ( false === $res ) {
$url = $http_url = 'http://api.wordpress.org/plugins/info/1.0/';
if ( $ssl = wp_http_supports( array( 'ssl' ) ) )
$url = set_url_scheme( $url, 'https' );
$http_args = array(
'timeout' => 15,
'body' => array(
'action' => $action,
'request' => serialize( $args )
)
);
$request = wp_remote_post( $url, $http_args );
if ( $ssl && is_wp_error( $request ) ) {
trigger_error( __( '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 <a href="https://wordpress.org/support/">support forums</a>.' ) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ), headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE );
$request = wp_remote_post( $http_url, $http_args );
}
if ( is_wp_error($request) ) {
print_r($request->error_data);
echo $request->errors;
$res = new WP_Error('plugins_api_failed', __( '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 <a href="https://wordpress.org/support/">support forums</a>.' ), $request->get_error_message() );
} else {
$res = maybe_unserialize( wp_remote_retrieve_body( $request ) );
if ( ! is_object( $res ) && ! is_array( $res ) )
$res = new WP_Error('plugins_api_failed', __( '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 <a href="https://wordpress.org/support/">support forums</a>.' ), wp_remote_retrieve_body( $request ) );
}