So, I'm on the main quest where I have to get Tullius and Ulfric to go to the Greybeard council thing. Anyway, my problem is that whenever I talk to Ulfric (I already got Tullius to go to the council) he says that Galmar wants to run an errand with me. I killed the ice wraith and have to go to Galmar, so I went to him, he said something and walked away. Also, whenever I talk to Ulfric he says the same thing, Galmar wants to run an errand with you. Please help. I'm on the 360 if that helps.

you made the mistake of starting the CW but not finishing it before the acquisition of Season Unending..

glitches have been known to appear in such a case...

I never even managed to get to Season Unending despite doing the civil war twice. You would have to go back to a previous save, and actually do more of the civil war.