Topic on Extension talk:Cite

Hello there, i'm running MW V1.19.3, everything worked perfectly after I installed Cite extension, now i get this error x2 on every page:

Warning: Cannot modify header information - headers already sent by (output started at /.../LocalSettings.php:1) in /.../includes/WebResponse.php on line 38

And can't access to my index/home page, the error just show up seven times, please can anybody help me?

The error message says: You have some text or whitespace (spaces, tab, empty lines) at the beginning of your LocalSettings.php before the "<?php" tag.

Remove it - "<?php" must be at the beginning of the file.