ErrorException - cannot access my website

Hey there, I am newbie blogger and i just love learning things by doing them first. This way I have enabled canonical URLs in the admin dashboard, but from the next moment, i am not able to open the website.

I am seeing the error message
Whoops \ Exception \ ErrorException (E_WARNING)
ini_set(): Headers already sent. You cannot change the session module's ini settings at this time

I have set back the 'canonical_url' setting via the application / config / site.php but the error keeps showing and it is not allowing me to do anything.

Is there any method to reverse the changes that i have made on my site, so that it can start working back again.

hutman replied on at Permalink Reply
If you switched it back you should just have to clear the cache by deleting everything in application/files/config