Maps need lighting rebuilt

Hi Guys
so i have not been using UE4 for about two weeks because of exams and all
so today i opened it and i started having this problem : "WorldInfo_0 Maps need lightning rebuilt "
i have tried everything.
even in new projects i get the same problem , i think it’s from the sward agint.
i hope you guys help.

To fix this error, you simply need to rebuild the lighting for the map.

246417-buildlightingbutton.png

i tried that .
it builds everything but lightning .
when done building i get an error WorldInfo_0 Maps need lightning rebuilt

Have you tried clicking the dropdown next to the button and clicking “Build Lighting Only?”

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