Can't write a log message.

Hi, I try to write a log message like this:

   

PHP Code:

public function test()
    {
        log_message('error', 'Some variable was correctly set');
        echo 'test';
    } 


When I access that route I fine test message but I see no log. It doesn't over the threshold since I clear the log folder already. I can see an error log if my code got some error but not when I try to trigger using this code. Thanks.