I'm not 100% sure, but I would guess that both of those defines that you bolded, should have catalog/ before the uploaded part....
So...
define('CONFIG_SYS_DEFAULT_PATH', CONFIG_SYS_MY_DOCROOT.'/catalog/uploaded/'); //accept relative path only
define('CONFIG_SYS_ROOT_PATH', CONFIG_SYS_MY_DOCROOT.'/catalog/uploaded/'); //accept relat
I'm guessing that your actual DOCUMENT_ROOT is in /, not /catalog. /catalog is just were you decided to install osc.