Fatal error: Uncaught TypeError: Unsupported operand types: string - int in /customers/b/d/3/goethe-verlag.com/httpd.www/database/common.class.php:249
Stack trace:
#0 /customers/b/d/3/goethe-verlag.com/httpd.www/book2/index.php(68): clsCommon->funcGetSelectLessonName('wnload_apps.htm...', 'load_apps.htmBN...')
#1 {main}
  thrown in /customers/b/d/3/goethe-verlag.com/httpd.www/database/common.class.php on line 249