Hi my site just broke, dont know why, didnt update or anything can some help?:)

http://www.peterharbeck.dk/

Im gettting this error:

Warning: Declaration of Concrete5_Model_Page::add(CollectionType $ct, $data) should be compatible with Concrete5_Model_Collection::add($data) in /customers/2/b/1/peterharbeck.dk/httpd.www/concrete/core/models/page.php on line 12 Warning: Declaration of Concrete5_Model_Page::duplicate($nc, $preserveUserID = false) should be compatible with Concrete5_Model_Collection::duplicate() in /customers/2/b/1/peterharbeck.dk/httpd.www/concrete/core/models/page.php on line 12 Warning: Declaration of Concrete5_Model_EditPagePropertiesPagePermissionAccess::save($args) should be compatible with Concrete5_Model_PermissionAccess::save() in /customers/2/b/1/peterharbeck.dk/httpd.www/concrete/core/models/permission/access/categories/custom/edit_page_properties.php on line 146 Warning: Cannot modify header information - headers already sent by (output started at /customers/2/b/1/peterharbeck.dk/httpd.www/concrete/core/models/page.php:12) in /customers/2/b/1/peterharbeck.dk/httpd.www/concrete/core/libraries/view.php on line 963 Warning: Cannot modify header information - headers already sent by (output started at /customers/2/b/1/peterharbeck.dk/httpd.www/concrete/core/models/page.php:12) in /customers/2/b/1/peterharbeck.dk/httpd.www/concrete/core/libraries/view.php on line 657