Have you first installed Metamod:Source and Sourcemod,? They are prerequisites to using any sourcemod plugins.
Also, your log right there is telling you that it's shutting down because you aren't using a valid game server login token, that it's being used elsewhere simultaneously. Can only use 1 token per server at a time.
Code:
* Steam account token was reused elsewhere. *
* Make sure you are using a separate account *
* token for each game server that you operate. *
* *
* To create additional game server accounts go to *
* http://steamcommunity.com/dev/managegameservers *
* *
* This game server instance will now shut down! *
* *