I installed Serendipity on my webspace, permissions were ok and this is what i get:

Warning: serendipity_smarty_init(): Unable to access /var/www/s14b22/html/serendipity/bundled-libs/Smarty/libs/Smarty.class.php in /var/www/s14b22/html/serendipity/include/functions_smarty.inc.php on line 558 ...