I joined the Rebellion, liberated Hjaalmarch, the Rift, and Falkreath and now have to report to Ulfric Stormcloak, but whenever I go to talk to him he doesn't give me the quest to go attack Solitude. I've read that you have to complete the Dark Brotherhood quest where you have to go to the wedding and kill the bride, but I did that a long time ago. Help please?