EOS Problem!!!!

https://dev.epicgames.com/community/learning/courses/1px/unreal-engine-the-eos-online-subsystem-oss-plugin/eK7q/unreal-engine-setting-up-a-dedicated-server-to-host-eos-sessions

Hello everyone, I’ve been using c++ for a very short time and I’m having trouble following this tutorial.
The tutorial is very simple and precise, except in one point that I don’t understand what I should do and it gives me an error.
Advice?

I’m stuck at the “Create an EOS Session” .cpp file