Forum bugs

[Ant]

Hi.

While posting messages, forum shows errors:

[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions_messenger.php on line 506: count(): Parameter must be an array or an object that implements Countable
[phpBB Debug] PHP Warning: in file [ROOT]/ext/paul999/mention/event/main_listener.php on line 381: sizeof(): Parameter must be an array or an object that implements Countable
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 1836: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3268)

Please fix.

[Simon123]

Yes, I get that error as well.