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Warning: Cannot modify header information - headers already sent by (output started at C:\Users\test\Documents\html\xampp\htdocs\sn\extensions\PdfExport\PdfExport.php:52) in C:\Users\test\Documents\html\xampp\htdocs\sn\includes\Exception.php on line 184
This error keeps appearing in my mediawiki installation. The "on line X" is varying, sometimes its lower (thirty-something). This problem was serious until I read that you can not edit LocalSettings.php in the notepad, because it will cause inserting invisible Unicode characters, so I used a proper software for editing code. I changed the secret code as adviced and this all reduced the problem a lot. Still, sometimes, this annoying error pops up, especially when I'm not logged in.
Anyone knows the solution? Good day to all of you and God bless you!