Playtest window stuck on loading screen

Complete beginner here.

Finally managed to get the play test window up and running and have already run into some issues.

When booting up a play test with the local host, it is stuck at 90% on the made with narrat loading screen. 2 problems have been highlighted, and i have no idea what they mean. I only added some characters, and started a new main script. (deleted the “main” that marked the demo script before)

How do i get the play test running again? And what stopped it from fully loading in the first place?