No, you're misreading the error message.
It says the problem is on line 1 of the file.
Quote:
Originally Posted by
g2ktcf
PHP Warning: Cannot modify header information - headers already sent by (output started at .../includes/languages/english/extra_definitions/fluorspar/extras.php:1) ...
Perhaps your text editor has added a blank line at the top, or has set an invalid BOM (Byte Order Mark).
Might be easiest to just recreate the file. Not by a complete copy-paste of the original, but by recreating its contents.
You could even start by just deleting the file, although I'm sure it contains definitions that the template depends upon, so you will need to recreate what is needed.