error message when calling page

when I run the page, where the shortcode is integrated, I get the following error message:

Fatal error: ob_start() [ref.outcontrol]: Cannot use output buffering in output buffering display handlers in /www.meinedomain.de/wp-content/plugins/mappress-google-maps-for-wordpress/mappress_map.php on line 356

greatings

Mario

http://ww.wp.xz.cn/extend/plugins/mappress-google-maps-for-wordpress/