You get this error because you are using Mozart 2, which is only supported on OS 10.8 / 10.9. For 10.7 use Mozart 1.4.
Now, if you installed Aquamacs3, Mozart will not be able to find Aquamacs. This is because Aquamacs has changed the directory names a bit. To solve this problem, open a terminal and enter the following commands:
ln -s / Applications / Aquamacs.app "/ Applications / Aquamacs Emacs.app" ln -s / Applications / Aquamacs.app / Contents / MacOS / Aquamacs "/Applications/Aquamacs.app/Contents/MacOS/Aquamacs Emacs"
This, of course, assumes that you have added Aquamacs to your applications. If not, change the directories in the above commands accordingly.
Hope this helps.
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