multi-create --core=6.x -> multi-create --core=6

Hi,
on my Debian machine i wanted to use DM to create a Multisite in a new empty dir that is within the apache htdocs folder but got the following errors, whatever version i pick at the end, following exactly the steps described on your website

dir with these rights:
Debian:/my/root$ drwxr-xr-x 2 something something 4.0K 2010-06-06 15:30 multisite

ERROR v1:
Debian:/my/root$ sudo drush multi-create /multisite --core=6.x
Missing argument 2 for drush_multi_create_validate() [warning]
multi.drush.inc:605
Invalid argument for destination, /multisite is no directory. [error]
Aborting
An error occurred at function : drush_multi_create_validate [error]

ERROR v2:
Debian:/my/root$ sudo drush multi-create /my/root/multisite --core=6.x
Missing argument 2 for drush_multi_create_validate() [warning]
multi.drush.inc:605
Missing argument for major-version. Aborting [error]
An error occurred at function : drush_multi_create_validate [error]

ERROR v3:
Debian:/my/root$ sudo drush multi-create /my/root/multisite --core=6.17
Missing argument 2 for drush_multi_create_validate() [warning]
multi.drush.inc:605
Missing argument for major-version. Aborting [error]
An error occurred at function : drush_multi_create_validate [error]

ERROR v4 (a bit different):
Debian:/my/root$ sudo drush multi-create /my/root/multisite --core=7.x
[sudo] password for myrootusername:
Missing argument 2 for drush_multi_create_validate() [warning]
multi.drush.inc:605
Undefined variable: core multi.drush.inc:625 [notice]
Missing argument for major-version. Aborting [error]
An error occurred at function : drush_multi_create_validate [error]
Command dispatch complete [notice]

Is there something not documented about the correct version that has to be put in at "7.x" or why does it got this way:

function drush_multi_create_validate($destination) {

else if (!is_dir($destination)) {
return drush_set_error('MULTI_INVALID_DESTINATION',
dt('Invalid argument for destination, !destination is no directory. Aborting',
array('!destination' => $destination)
)
);
}

Best Regards
Torsten Zenk