This error message appeared while I was troubleshooting a DHCP server:

  % /etc/init.d/dhcp3-server restart 2>&1 |  nl
     1	dhcpd self-test failed. Please fix the config file.
     2	The error was:
     3	Internet Systems Consortium DHCP Server V3.1.0
     4	Copyright 2004-2007 Internet Systems Consortium.
     5	All rights reserved.
     6	For info, please visit http://www.isc.org/sw/dhcp/
     7	/etc/dhcp3/dhcpd.conf line 0: expecting a parameter or declaration
     8	#}
     9	  ^
    10	Configuration file errors encountered -- exiting

Line #7 refers to "etc/dhcp3/dhcpd.conf line 0"; the zero seems meaningless.

My config file exists and is not empty:

     % wc /etc/dhcp3/dhcpd.conf
     108  533 3569 /etc/dhcp3/dhcpd.conf

The error parser might have some kind of fencepost error.  I had been
trying to narrow down an error by commenting things out, and when it was
all comments, the "line 0" error appeared.

If an all comments file should return an error, any line number is
misleading; suggested replacement for line #7 above:

	error in /etc/dhcp3/dhcpd.conf: all comments or white space, nothing to do.

Hope this helps...

Dear submitter,

as the package isc-dhcp has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1143544

The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)