Pianina, Fortepiany

Fatal error: Uncaught Error: Using $this when not in object context in /home/bluthner/ftp/mods/mod.list_menu/list_menu.class.php:21 Stack trace: #0 /home/bluthner/ftp/mods/mod.list_menu/list_menu.php(9): list_menu::showMenu('index', 'smoothmenu1') #1 /home/bluthner/ftp/core/builder.class.php(509): include('/home/bluthner/...') #2 /home/bluthner/ftp/core/builder.class.php(121): builder->modExecute('smoothmenu1', Array) #3 /home/bluthner/ftp/store/default.php(13): builder->mod(Array) #4 /home/bluthner/ftp/core/builder.class.php(382): include('/home/bluthner/...') #5 /home/bluthner/ftp/core/run.php(56): builder->buildHTML() #6 /home/bluthner/ftp/index.php(11): require('/home/bluthner/...') #7 {main} thrown in /home/bluthner/ftp/mods/mod.list_menu/list_menu.class.php on line 21