Erro ao copilar

amigos estou com esse erro aqui !

soulfireCondition->addDamage(std::ceil((player->getLevel() + player->getMagicLevel()) / 3.), 9000, -10);

como nao sei muita coisa de programção vim ate vcs

In static member function `static bool RuneSpell::Soulfire(const RuneSpell*, Creature*, Item*, const Position&, const Position&)': 

1832 C:\Documents and Settings\iTaLLoZiN\Meus documentos\trunk.r3777.r15\sources\spells.cpp [Warning] passing `double' for converting 1 of `bool ConditionDamage::addDamage(int32_t, int32_t, int32_t)'