when i enter

./config-fast.sh localhost.localdomain

the error is:

Your fully qualified host name is localhost.localdomain.
Putting localhost.localdomain into control/me...
./config-fast.sh: line 5: QMAIL/control/me: No such file or directory
chmod: cannot access `QMAIL/control/me': No such file or directory
Putting localhost.localdomain into control/defaultdomain...
./config-fast.sh: line 11: QMAIL/control/defaultdomain: No such file or directory
chmod: cannot access `QMAIL/control/defaultdomain': No such file or directory
Putting localhost.localdomain into control/plusdomain...
./config-fast.sh: line 18: QMAIL/control/plusdomain: No such file or directory
chmod: cannot access `QMAIL/control/plusdomain': No such file or directory
Putting localhost.localdomain into control/locals...
./config-fast.sh: line 23: QMAIL/control/locals: No such file or directory
chmod: cannot access `QMAIL/control/locals': No such file or directory
Putting localhost.localdomain into control/rcpthosts...
./config-fast.sh: line 27: QMAIL/control/rcpthosts: No such file or directory
chmod: cannot access `QMAIL/control/rcpthosts': No such file or directory
Now qmail will refuse to accept SMTP messages except to localhost.localdomain.
Make sure to change rcpthosts if you add hosts to locals or virtualdomains!

how can i solve it?

i have entered these commands befor that:

/downloads/qmailrocks/scripts/install/qmr_install_linux-s1.script
/downloads/qmailrocks/scripts/util/qmail_big_patches.script
cd /usr/src/qmail/qmail-1.03
make man && make setup check

Make sure that the directory /var/qmail exists and you have the rights to write in that directory.

you may follow these steps.... there should not be any problem..

http://www.lifewithqmail.org/lwq.html#installation