The younger brother's ProFTP service failed to start. The error message is displayed. Please give me some advice. Thanks again

The younger brother's ProFTP service failed to start. The error message is displayed. Please give me some advice. Thanks again-Linux Enterprise Application-Linux server application information. For more information, see the following. Dear prawns, the younger brother's Web Server (Centos5.4 System) is encountering a difficult problem. The ProFTP service cannot be started. The specific error message is as follows:

[Root @ dedi044 ~] # Proftpd
Bytes ------------------------------------------------------------------------------------
-IPv4 getaddrinfo 'dedi044 .lax1.coolhandle.com 'error: Name or service not known
-Warning: unable to determine IP address of 'dedi044 .lax1.coolhandle.com'
-Error: no valid servers configured
-Fatal: error processing configuration file '/etc/proftpd. conf'
Bytes ------------------------------------------------------------------------------------

Is it because of incorrect hosts file settings?
My hosts file is as follows:

[Root @ dedi044 ~] # Vi/etc/hosts
---------------------------------------------------------------------
# Do not remove the following line, or various programs
# That require network functionality will fail.
127.0.0.1 dedi044.lax1.pronethosting.net dedi044 localhost. localdomain localhost
: 1 localhost6.localdomain6 localhost6
--------------------------------------------------------------------

Ask what causes the failure?