بروز مشکل پس از ایجاد تغییر در database.php

[taktops]

با سلام،
بعد از این که فایل database.php رو با Dreamweaver با توجه به آنچه اینجا ([مهمان/کاربر گرامی برای دیدن لینک ها ابتدا باید عضو سایت شوید و لاگین کنید برای ثبت نام اینجا کلیک کنید]) گفته شده بود ادیت کردم ،این وارنینگ ها بالای سایت اومدن:

Warning: Cannot modify header information - headers already sent by (output started at /home/taktops/public_html/includes/database.php:2108) in /home/taktops/public_html/includes/core.classes.php on line 2724

Warning: Cannot modify header information - headers already sent by (output started at /home/taktops/public_html/includes/database.php:2108) in /home/taktops/public_html/includes/core.classes.php on line 2496

Warning: Cannot modify header information - headers already sent by (output started at /home/taktops/public_html/includes/database.php:2108) in /home/taktops/public_html/includes/core.classes.php on line 587

Warning: Cannot modify header information - headers already sent by (output started at /home/taktops/public_html/includes/database.php:2108) in /home/taktops/public_html/includes/core.classes.php on line 588

Warning: Cannot modify header information - headers already sent by (output started at /home/taktops/public_html/includes/database.php:2108) in /home/taktops/public_html/includes/core.classes.php on line 589

Warning: Cannot modify header information - headers already sent by (output started at /home/taktops/public_html/includes/database.php:2108) in /home/taktops/public_html/includes/core.classes.php on line 590

Warning: Cannot modify header information - headers already sent by (output started at /home/taktops/public_html/includes/database.php:2108) in /home/taktops/public_html/includes/core.classes.php on line 591

دلیلش چی هست؟لطفاً راهنماییم کنید!