HOW TO: Creating a RaceEvent with Paid Content

Hello,
i'm using SteamCMD regualry, and trying to download a workshop item I read the error in pic here following

How I can fix the problem? Thanks for your help!

 

Hello, I've been trying to create a server for months, today I'm in trouble again but it's impossible, all the steps are perfect, I create the mod with perfect paid content, I put the dedicated one and launch the perfect server, but then in the game never comes out. I have looked and re-looked at the ports and everything is perfect, what could it be, the truth is that I hope you get something to create easy servers without being a NASA engineer. I am already desperate to do all the steps correctly but then the server does not appear in the game, please help.