Cannot add header information error

Hi guys
I have this error when I tried to use a sign-up form.
The thing is that I use some classes for database interaction, and I
respond by 
return "Values"; 
to the functions.
Also, in line 18 in  page.php I have this 
Header("Location: page1.php?string=value");
The Line 363 marks the class end ?>

Warning: Cannot add header information - headers already sent by (output
started at classes/member_class.php:363) in F:\Web Applications\My
work\site\page.php on line 18

Could someone explain what is happening, the code is clear.

Thanks



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