If you have been following along with the lectures and got to the point of hitting PLAY to check your output log but get an error that you cannot play in the Editor while Adding Component. It is likely that you need to save your level which wasn’t covered in this section of the course so is easy to forget to do.
Once you have your level setup go to the Unreal Engine and click File>Save All and if you haven’t saved your level then it’ll ask for a name for your level.
Looking at Mike’s naming, simply call it “BuildingEscape” and hit Save. You can call it whatever you like though as long as it doesn’t contain a space or special characters.