check the item table for the item you are trying to buy.. it may have a cost(or price forgot the field name) at zero or lower. not 100% sure but might be the place to look.
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Perfect quote from another site: it's immature pricks who refuse to read the numerous stickies in every forum pointing out what to do and what not to do that get flamed. Grow up and learn to do your fucking homework before opening your cake hole, junior. EQEmu doesn't like you anymore, and that's why you're getting errors. So go away.
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