No DK ghoul?

A few players have reported this, yes, Zathe.

This is an issue that can popup from time to time on various abilities.

I do see you have a petition open, please do leave that open so we can look into this for you.

One workaround that will often address this is to get your ghoul killed. Now, obviously that's not going to work if he's not already summoned and you can't summon him :)