[Dovecot] Dovecot Errors - Using Debian

[Mark Smith]

I recieve this error when trying to apt-get dovecot-common

[Error Starts]
apt-get install dovecot
Reading Package Lists... Done
Building Dependency Tree... Done
The following extra packages will be installed:
  dovecot-imapd dovecot-pop3d
The following NEW packages will be installed:
  dovecot dovecot-imapd dovecot-pop3d
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0B/568kB of archives.
After unpacking 1163kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Selecting previously deselected package dovecot-imapd.
(Reading database ... 14230 files and directories currently installed.)
Unpacking dovecot-imapd (from .../dovecot-imapd_0.99.14-1_i386.deb) ...
Selecting previously deselected package dovecot-pop3d.
Unpacking dovecot-pop3d (from .../dovecot-pop3d_0.99.14-1_i386.deb) ...
Selecting previously deselected package dovecot.
Unpacking dovecot (from .../dovecot_0.99.14-1_all.deb) ...
Setting up dovecot-common (0.99.14-1) ...
Creating generic self-signed certificate: /etc/ssl/certs/dovecot.pem
(replace with hand-crafted or authorized one if needed).
hostname: Unknown host
dpkg: error processing dovecot-common (--configure):
subprocess post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of dovecot-imapd:
dovecot-imapd depends on dovecot-common (>= 0.99.12-1); however:
  Package dovecot-common is not configured yet.
dpkg: error processing dovecot-imapd (--configure):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of dovecot-pop3d:
dovecot-pop3d depends on dovecot-common (>= 0.99.12-1); however:
  Package dovecot-common is not configured yet.
dpkg: error processing dovecot-pop3d (--configure):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of dovecot:
dovecot depends on dovecot-imapd; however:
  Package dovecot-imapd is not configured yet.
dovecot depends on dovecot-pop3d; however:
  Package dovecot-pop3d is not configured yet.
dpkg: error processing dovecot (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
dovecot-common
dovecot-imapd
dovecot-pop3d
dovecot
E: Sub-process /usr/bin/dpkg returned an error code (1)
[Error Ends]

What Should I do??
I am Using Debian Sarge

PLEASE HELP

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