You have a typo there. The proper command is:
$ lein cljsbuild auto async-tut1
Note the one instead of the ell.
Re:ClojureScript 101
by swannodette_ on Friday November 08, 2013 @10:51PM
(#6700620)
The project is async-tut1 not async-tutl. Look at your project.clj.
edit: ell instead of 1. I guess that's why I use a heavily-serifed font for my coding. I even re-read the command several times looking for a simple typo to catch exactly this problem.