Your mmo.h PACKETVER should be like this.
src\common\mmo.h
#ifndef PACKETVER
#define PACKETVER 20120410
//#define PACKETVER 20111116
#endif
Save and recompile.
conf\battle\exp.conf
// Base exp. penalty rate (Each 100 is 1% of their exp)
death_penalty_base: 100
// Job exp. penalty rate (Each 100 is 1% of their exp)
death_penalty_job: 100