SPOILER Temple Of Legends, Having Some Issues

As some you know, in the lvl 69 quest Temple Of Legends, you need a certain helmet to kill the Cow (Corrupter of the Worlds). And for that you need 4 items, 1 Old Touroto Hide, 1 Aseado Leaf, 1 Maro's Eye Jewel and 1 Coral of Nelfors which you have to give to Garul. Garul hides in the creeper cave and you need a creeper mask to enter it. But here`s the problem that i`m having: Even though I have the creeper mask on, i still can`t enter the cave. Could someone help me?

 

you need to complete the quest "creeper infiltration" to enter

 

Oh, thanks! I found out that i had done the creeper quest in my other class xD

Thank you for the help