Error Parsing API

So I wanted that I can download stuff on my TTT server with the workshop, but everytime I start up the server I get this error :

http://puu.sh/3up5t

I added this in the startup bat : srcds.exe -console -game garrysmod +map ttt_minecraft_b5 -maxplayers 16 -authkey MY AUTHKEY +host_workshop_collection 150271508

I tried it with different collections from the workshop but its always the same error. Couldnt find anything on Google.

Are you sure you entered your key correctly?

Yep im pretty sure I did :confused: