The way you look for the path of catalog.dtd doesn't work in ASDF 3. Here is a supported way that works with all versions of ASDF 2 and later.

I'll try to improve backward compatibility, but you may nonetheless want to apply the patch. Also, I believe that three years afterwards, and with each and every implementation providing ASDF 2, it is safe to remove the #-asdf2 code around your codebase.

—♯ƒ • François-René ÐVB Rideau •Reflection&Cybernethics• http://fare.tunes.org Work harder! Millions on welfare depend on you.