Entering Ravana Altar for Helm causes Maple Crash

Describe the problem. Be as specific as possible!:

After the quest to obtain MMB
you are given another chance to collect sunburst and fight ravana again at eitehr channels 6 7 or 8
upon entering the altar for ravana my maplestory crashed into this error

 Images of problem

I solved the problem. I partied with another person and I was able to enter.

If you talk to Dao, literally talk to him, he says 2 required to enter, player must be in same map, 30 min time limit.