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WorldSettings_1 Maps need lighting rebuilt

Hi!
My problem is the following:

I got this error:
Performance Warning: No importance volume found and the scene is so large that the automatically synthesized volume will not yield good results. Please add a tightly bounding lightmass importance volume to optimize your scene’s quality and lighting build times.

So I placed a lightmass importance volume, and covered with that the entire landscape.

After this, I get this error: (image attached)
WorldSettings_1 Maps need lighting rebuilt

I didnt found any solution. please help me what should I do