functions.php problem

Hi,

I removed some functions in my funcitons.php, and I got error message:

Warning: Cannot modify header information – headers already sent by (output started at /data01/virt26101/domeenid/…/htdocs/wp-content/themes/a3w/functions.php:1) in /data01/virt26101/domeenid/…/htdocs/wp-admin/theme-editor.php

If copied my old functions.php back (which worked perfectly 6 months),I still got that error message. If I delete my functions.php, then all okay. Put if I but it back then error messages comes again and I can’t save my functions.php in admin panel.

If anyone knows solution, please help me!

Regards!