Question about X mark on spotlight while creating blueprint, also no event creation for nodes

“Lighting needs to be rebuilt, 5 unbuilt objects”

But this message has always occured, both in the video tutorial guy’s editor and in my own editor.

However, that didn’t prevent me from creating a blueprint with lights and using event nodes earlier.

Also, i opened the log, here’s the message:-

https://i.sli.mg/ZxmyWN.png

Also, the lighting unbuilt error message only occurs when i place any lights into the level.
Here, i had not placed any and had directly gone to work on the blueprint, so i ran the default third person map.