Why i can't subscribe in an addon?

Ok, today (30/12/2015) i tried do subscribe to an addon of my friend
But, when i press, i go to gmod, but it not appear on the sbuscribed list, so, i go see my subscribed itens on the workshop, the addon was not there, i go to the page of the addon, and the unscribed button (it appear when u subscribe to any thing) have transformed again into the subscribe button
Somenone’s can help me with it?

How many addons do you have? Because someone had a problem where they couldnt have more than 50 addons.
-Try deleting some and try again.
-Try restarting gmod/ PC
-Try verifying gmod