Fatal error: require_once(): Failed opening – bootstrap.inc

Hi guys, I am not a professional but running my own drupal page. Last week I wanted to Login and became the following Error: Fatal error: require_once(): Failed opening required ‘/homepages/35/d244905567/htdocs/marcello-camerin/sites/all/modules/views/plugins/views_plugin_display_default.inc’ (include_path=’.:/usr/lib/php5.5′) in /homepages/35/d244905567/htdocs/marcello-camerin/includes/bootstrap.inc on line 3179 Line 3179 in the bootstrap.inc says: require_once DRUPAL_ROOT[…]