Board Thread:Help!/@comment-25361328-20140829045129

I've killed the wall of flesh around 10 times by now and hardmode still isn't activating. The message that pops up in the text box after defeating the wall of flesh says something along the lines of "The ancient spirits of light and darkness denied the sacrifice.". I have killed the eye of cthulu, skeletron, eater of world, and the slime king. Is there a new way to activate hardmode or am I missing something? 