Swarm fail to kick off in Xolo Berlin Flat

MapCheck:Error: Error WorldSettings_1 Maps need lighting rebuilt.
There one Error and many warnings in 4.11.2- in 4.10 all was right!!!

PS - I am using many programs, but UE4 is the only one, which in 99% of cases make mess in new version with WORKING previous versions of the projects. One friend advice- discontinue failure projects like Fortnite, Paragon, UT, Shadow Complex, ARK and CONCENTRATE/FOCUS ONLY on UE4!!!