I was doing the quest to kill the Ice Wraith to join the Stormcloaks, when I left my follower, Marcurio, on the side of a cliff, because he was getting in the way.
After I completed the quest, I went back to find him but I couldn't. So, I went back to Riften and found him at the Bee and Barb, where I recruited him. When I speak to him, he acts like I've got a follower and says "looks like you've got someone already" and stuff like that.
How do I fix this so he is following me again?