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lush.el calls a function that is deprecated and removed in emacs24. Fortunately, there seems to be a drop-in replacement that works for both emacs23 and emacs24.
In lush.el, replace the call to "internal-find-face" with "facep". This replacement is suggested by emacs' homepage (http://www.gnu.org/software/emacs/news/NEWS.24.2), and it worked for me.