[Commentor] LC-388 Bruno von Niman (ANEC W3C) on behalf of ANEC [Comment] Chapter 5.4.13, Error messages: The purpose of error messages should be dual: 1. To provide information to the user; and 2. To provide information to the service provider. The recommendation should cover both aspects. [Commentor reply] no reply from commenter [Working Group decision] 
Telling providers to check their error logs is out of scope for this document.