[exim] lmtp problem

Hi!
I have to setup an exim cyrus mailsever on a dedicated server.
This is the first experience with Exim and I have a problem with lmtpd.
I have this router:

real_local_cyrus:
driver=accept
check_local_user
domains = +local_domains
transport = local_delivery_cyrus

and the transport:

local_delivery_cyrus:
driver = lmtp
command = /usr/sbin/cyrdeliver -l
batch_max = 20
user = cyrus
group = mail

When I restart Exim4.20 I receive this error:
-transport local_delivery_cyrus: cannot find transport driver "lmtp"-

But if I use the commando cyrdeliver -a user.mbox < testmail the mail
goes in the box using lmtpunix...
I installed all cyrus-imapd with rpm, exim was yet installed on the
server.
I hope you can help me!
Bye.