After installation on the server, when I go to the setup.cgi url I get an internal server erro message.

extract from the error messages log:

the Premature end of script headers: /Path-to/cgi-bin/repertory/admin/setup.cgi
GT::SQL (9949): Wrong argument passed to this subroutine. Usage: The defs directory 'repertory/admin/defs' does not exist, or is not a directory. at Links.pm line 78.
BEGIN failed--compilation aborted at /path-to/cgi-bin/repertory/admin/setup.cgi line 18.
Premature end of script headers: /Path-to/cgi-bin/repertory/admin/setup.cgi

What could I have done wrong?

The directory defs exists in the admin directory and it's 777 chmoded

Links 2.0 fresh installation
MacOS X Server 1.2 running iTools 5.019
Apache 1.3.14
MySQL MySQL 3.22.25
installation with mod_perl: NO