camargotobon,

Yours is a different error than mine. Most likely, you have uploaded your files using the wrong format. make sure your ftp client is configured to upload in ASCII format.

another way this could happen is if you edited the file and you have whitespace (a space or a carriage return) at the beginning of the file, before the opening php tag.

a third way could be an editor that added trash (a technical term :)) to the beginning of the file. I've heard that ultraedit and cpanel can do this to a file, although I've never used them myself.

-nick