Shadows are completely black?

Hi there!
I am brand new to Unreal Engine and I’ve played around for a couple of days. For some reason, all of a sudden the shadows turn black and when the player is standing in the shadow then the player is also completely black. It’s not like this from the start but then when I least expect it, it happens even though I haven’t made any changes. Is this because my computer suck or something else? I get two warnings on the screen. “Lightning needs to be rebuilt” and “Reflection captures need to be rebuilt”.

Thanks in advance,

If any lights are set to static (not stationary or movable), especially the larger light sources (directional, skylight), then the lighting needs to be rebuilt after changes are made. Reflection capture rebuilding action is somewhere in the viewport dropdowns. If those don’t work, post a screenshot of the skylight, directional light(s), and Lightmass World settings.