upgrade problem

I attempted to upgrade my guestbook 2.3.4 to lazarus and I'm now getting the following message, You can't access this file directly...
I followed the directions for upgrading by editing the config.inc.php file using the settings from my config.inc.php file in advanced guestbook. I did a backup of my guestbook database prior to loading the files from the lazurus download into my guestbook folder. I attempted to run the agupdate.php but it didn't work until I restored the database backup. I then ran the agupdate.php and I got the following message,Tables successfully updated! Please login to the admin and go to general Settings where you will need to change the new Character Set option to match the character set your guestbook was using. You can find this out by viewing the language file you have been using. I then signed into admin and got the following message,Warning: Cannot modify header information - headers already sent by (output started at /home/trinity/public_html/guestbk/admin/config.inc.php:56) in /home/trinity/public_html/guestbk/lib/admin.class.php on line 44

Warning: Cannot modify header information - headers already sent by (output started at /home/trinity/public_html/guestbk/admin/config.inc.php:56) in /home/trinity/public_html/guestbk/lib/admin.class.php on line 45

Warning: Cannot modify header information - headers already sent by (output started at /home/trinity/public_html/guestbk/admin/config.inc.php:56) in /home/trinity/public_html/guestbk/lib/admin.class.php on line 46

Warning: Cannot modify header information - headers already sent by (output started at /home/trinity/public_html/guestbk/admin/config.inc.php:56) in /home/trinity/public_html/guestbk/lib/admin.class.php on line 47
Any suggestions and to how I can get my guestbook back?

Sounds like you have some white space after the closing ?> of the config.inc.php file which is located in the admin folder. basically ?> shoul dbe the very last thing in the file. Nothing at all after it, no spaces letter or anything.

Any idea why I'm getting this message when I try to access my guestbook,You can't access this file directly...

You have set IS_MODULE to true in the config.inc.php file.

I don't have a IS_MODULE to true line in the config.inc.php file.
Thanks!

I was able to get a fresh install of lazurus to work!
Thanks so much for your help