Syserr problem

Hi Elitepvpers,
I have 2 problems and I hope that you can help me.

Code:

SYSERR: Aug 13 01:06:37 :: Click: CQuestManager::Click(pid=76872, target_npc_name=Seon-Pyeong) - NOT EXIST NPC RACE VNUM[20091]

This is my first problem and I don't know how to fix this.

Code:

terminate called after throwing an instance of 'std::logic_error' what(): basic_string::_S_construct NULL not valid

And this is my second problem, I don't know where can be the problem, is this quest problem or mysql problem?

Thanks for every advice!

skurto...