loadextension again

I get this when I was finish my instalations. I have read this topic:http://modxcms.com/forums/index.php/topic,3736.0.html
so my question are: have the instalation to be in"root" of the site ? In my dir "extenders" there was no file.
I have it like this:http://rent-toy.no/modx/

Warning: loadextension(/hsphere/local/home/renseri/rent-toy.no/modx//manager/includes/extenders/dbapi.mysql.class.inc.php): failed to open stream: No such file or directory in /hsphere/local/home/renseri/rent-toy.no/modx/manager/includes/document.parser.class.inc.php on line 42

Warning: loadextension(): Failed opening ’/hsphere/local/home/renseri/rent-toy.no/modx//manager/includes/extenders/dbapi.mysql.class.inc.php’ for inclusion (include_path=’.:/usr/local/lib/php’) in /hsphere/local/home/renseri/rent-toy.no/modx/manager/includes/document.parser.class.inc.php on line 42

Fatal error: Cannot instantiate non-existent class: dbapi in /hsphere/local/home/renseri/rent-toy.no/modx/manager/includes/document.parser.class.inc.php on line 43

I get was it was wrong. My ftp-program didn’t upload all. I uploadet all without "install" and now it’s seem to be ok.