New songs I put on my iTunes won't sync to my iPhone?

I have everything I need to have music synced onto my iPhone, but it's not working. I have tried unplugging and replugging the cord, but it still doesn't work. I also tried updating iTunes, but it still doesn't work. Usually iTunes would tell me what music I'm syncing onto my iPhone, but now all it does is sync my iPhone and show me this.http://puu.sh/1IOyg
Sorry, I'm trying to be as clear as I can.

Have you tried re-setting your phone?