EOS Can't create session, Session already created

Hi, I’m currently trying to implement Epic Online Service to my FPS Game. I followed some tutorials, but when I run it, instead of going to the accountportal, it says error can’t create session because session already created.

Then I added the DevAuth Tool. Now instead of saying that the session already created, it says can’t create session because not logged in.

image

Here’s my code link:

Also here’s the proof that I already create a credential on the DevAuth Tool:

Any solution to this problem?