Cannot modify header information

[nafas]

i have installed cmsmadesimple successfully, and i translated it and edited all pages in order to change its look and feel(in admin section),till then everythings was OK.
after that i have to change the server, so i did it in addition i rename the 'cmsmadesimple' directory to 'mySite' and then change the related configuration in config.php.now when i run addcontent.php(this happens only for this page!!!!) i get these warnings:

Warning: Cannot modify header information - headers already sent by (output started at c:\program files\easyphp1-8\www\mySite\admin\addcontent.php:1) in c:\program files\easyphp1-8\www\mySite\lib\classes\class.admintheme.inc.php on line 162

Warning: Cannot modify header information - headers already sent by (output started at c:\program files\easyphp1-8\www\mySite\admin\addcontent.php:1) in c:\program files\easyphp1-8\www\mySite\lib\classes\class.admintheme.inc.php on line 165

Warning: Cannot modify header information - headers already sent by (output started at c:\program files\easyphp1-8\www\mySite\admin\addcontent.php:1) in c:\program files\easyphp1-8\www\mySite\lib\classes\class.admintheme.inc.php on line 168

Warning: Cannot modify header information - headers already sent by (output started at c:\program files\easyphp1-8\www\mySite\admin\addcontent.php:1) in c:\program files\easyphp1-8\www\mySite\lib\classes\class.admintheme.inc.php on line 169

Warning: Cannot modify header information - headers already sent by (output started at c:\program files\easyphp1-8\www\mySite\admin\addcontent.php:1) in c:\program files\easyphp1-8\www\mySite\lib\classes\class.admintheme.inc.php on line 172

Warning: Cannot modify header information - headers already sent by (output started at c:\program files\easyphp1-8\www\mySite\admin\addcontent.php:1) in c:\program files\easyphp1-8\www\mySite\lib\classes\class.admintheme.inc.php on line 177

i try to run the origin one(i mean addcontent.php whithout any modification),but i still get these warnings!
please help!!
thanks in advance

[nafas]

i finally find the problem.in the first line before '<?php' there was a blankspace. when i remove it, all warnings has gone.