Comments: "You are not authorized to post comments." I'm using Drupal 7.
I'm trying to add comments to a node but I get this error back:"You are not authorized to post comments".
I can't find in the code which variables are being checked to don't allow me to post a comment. 
Can someone tell me where to look in the code?
Thank you very much
Go to: admin/people/permissions

Check de permission:


Post comments


Click button "save permission".