help please

this is the code
#ifdef __MONSTER_NOTICE
if( m_pDefender->GetProp()->dwClass == RANK_SUPER && m_pDefender->GetWorld()->GetID() == WI_WORLD_COLOSSEUM )
{
CString BossNotice;
BossNotice.Format( prj.GetText(TID_BOSS_DIE), m_pAttacker->GetName(), m_pDefender->GetName());
g_DPCoreClient.SendSystem(BossNotice);
}
and this is the error
c:\progs\Source\Program\WORLDSERVER\AttackArbiter. cpp(1113): error C2065: 'g_DPCoreClient' : undeclared identifier
c:\progs\Source\Program\WORLDSERVER\AttackArbiter. cpp(1112): error C2065: 'TID_BOSS_DIE' : undeclared identifier
c:\progs\Source\Program\WORLDSERVER\AttackArbiter. cpp(1113): error C2228: left of '.SendSystem' must have class/struct/union type
type is ''unknown-type''

