iCloud Music Session Has Expired - Login Freezes iTunes
I am getting the iCloud Music Session Has Expired message whenever I start iTunes. When I sign in with my password, I get the rainbow wheel of death and it never logs into my iCloud session. If I try to cancel this window, it will pop up 2 to 3 more times. If I click the red X button, the window disappears. In all of these situations, I cannot select anything in iTunes. I cannot open any music, I cannot transfer any music to a device, I cannot open any options like preferences or even log out (these are all options are greyed out). So I cannot try any of the suggestions that have already been described here. I'm running El Capitan 10.11.2, and the most updated version of iTunes.
Thanks for any help!!
MacBook, OS X El Capitan (10.11.2)