spark Command "list" not found. ** RESOLVED - CONFIG ERROR **

I finally tracked down this problem to a bad entry in my app/Config/Autoload.php file. I had added a PSR-4 mapping for my SAML (SimpleSAML) that pointed to a shared autoload.php file instead of an actual path. I have other namespaces loaded here, not sure why this did not trigger some sort of error, but seems to be working now that it is fixed.