When opening my level, all my lights arn't working.

So I’ve been playing around on this level, fairly new to unreal. Reopen this level that I know for a fact I saved because the objects are still showing up in unlit mode, however the lights won’t work. The problem isn’t anti-aliasing and my lighting definentally wasn’t like this when i closed it. Here are my computer specs, and a screenshot of my screen.
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did you try building lights?