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Help! Failed to allocate 8x8x8 in distance field atlas

I changed the distance field resolution scale on a few of my meshes and while it was generating the distance fields my computer decided to restart and now when I open the editor I get a bunch of these messages in the log “Failed to allocate 8x8x8 in distance field atlas”.

Now all the shadows/AO are gone

How do I force the editor to rebuild all the DFs from scratch?

I copied my project to another computer and everything worked fine so I decided to re install UE4 on my main computer and I’m still having the issue.

Please anyone know how I can fix this problem? I’m so close to finally releasing on steam and this last minute head ache is killing me.

The solution is to delete the derivedDataCache in the common folder in the unreal engine folder in AppData.