wordpress安装插件提示“wordpress发生意外错误，可能WordPress.org或服务器配置文件存在问题”

} 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&#8217;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&#8217;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&#8217;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 ) );
        }