Install error - cannot go home

Installation seem to go well I can work in control, etc., but trying to go to 'Home' gets me this:

Warning: main(../categories/layout_categories_as_yahoo.php): failed to open stream: No such file or directory in /yacs/index.php on line 384

Warning: main(): Failed opening '../categories/layout_categories_as_yahoo.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /yacs/index.php on line 384

Fatal error: Cannot instantiate non-existent class: layout_categories_as_yahoo in /yacs/index.php on line 385