I noticed that, since the update today, I needed to update my dedicated server.
I didn't really know how to do that, so I googled around and did this:
I went into SteamCMD.
I entered: login anonymous
then: app_update 232250 validate
I waited for the thing to load all the files.
I opened my server.
It said that I still need to update it.
Gimme help.
SOLUTION: Ran tf.bat.