alwais the brain.exe was a good suggestion for it, i want not to show brutal whit the older answer, but:

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This problem usualy come from encrypted files or mobskills.
First check your NPCQuest.Sdata and see if its decrypted in server files.
If the problem is not the that try to go a bit into this thread PS Game.exe ERROR
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if there are some little difference, i'm sure u can find in your files what have your server side wrong basing you on what they say.. and if isn't that, only searching 'Loading Dump File' with search button i found more pages about, and i can't think that your issue is different from all the others.