header

[WrigleyF]

What should I do if I want to change the header on my site but the program won't let me--it says that it can't "modify header information?"

[suwunk]

This is commonly known as the "whitespace problem".

The error message typically looks something like

Warning: Cannot modify header information - headers already sent by..... (line numbers and file names may vary)
The problem is that many editors seem to add additional blanks (spaces) and/or empty lines at the end of a file when you edit it or may have been caused by your FTP or text editor software.