I upgraded my app from ST 2.0 to ST 2.1 with the new cmd tool and it worked fine for me.
But I can't build my app with sencha app build testing. With CMD v 2 and SDK Version 2.0 the building process have no error.
First error was with sass, due to that I haven't installed compass, but I removed the sass compiling process from build-impl.xml
Now I get the following error:
Unknown definition for dependency : Deft.mvc.ViewController