remove ~/.eMule and ~/.aMule/clients.met:
rm ~/.eMule ~/.aMule/clients.met
in fact, if you'd take the consideration, try moving _only_ ~/.eMule to some other place and see if aMule starts. if it does, please come into #amule at irc.freenode.net and send that file to Xaignar (developer) so he can see what the problem is. if it sitll doesn't start, just remove both files and it'll surely start
Greetings!