Something obviously happened since last night if it has been working fun up till now. Have you tried rebooting your PC? Have you checked how much memory you have available? You will want at least 700MBs to even think about starting EQ with luclin models on.
Also, you might want to check out this list of fixes that could possibly help out:
http://www.eqemulator.net/forums/showthread.php?t=25327
Otherwise, I would heavily focus on what you changed since last night, or what happened, because if it did work and doesn't now, it has to be on your end.
Make sure to give more details on exactly what is happening and where it is crashing if none of this info resolves your issue.
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