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Worldinfo_0 Maps need Lighting rebuilt

Hello , i am facing a problem of lighting not being built . I have used foliage tool to place multiple trees and grasses , i tried using https://forums.unrealengine.com/development-discussion/rendering/33692-error-maps-need-lighting-rebuilt this method of Force No Precomputed Lighting to remove all the lightmaps and reloading the map still the problem remained. I have tried cloning the project file to get the problem resolved,I tried migrating the entire level to a new project without any success. When i check the swarm agent i notice that it is getting stuck at exporting the scene and it doesnt progress to emmiting photons.

I tried to bake after deleting all the foliage instanced objects and the scene started emmiting photons but even after more than 12+ hrs it was stuck at 3% .

In my scene i have a stationary skylight and a static direction light.

Any help would be appreciated. alt text

Product Version: UE 4.18
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asked May 28 '18 at 04:34 AM in Using UE4

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