UN4.15 crash when using build

a few weeks nothing works with build
i try to open a new project, new level, and immediatelt when i use build , i have this message
Build Status : 0:00 Starting up swam connection …(100%)
and UN4 editor crash

trying to delete all files in swarmcache nothing
trying to get more memory virtual 200 Go hehehehe nothing at all

i don’t know what’s the problem exactely.
nothing in the scene just a new new new level but crash just using build . why |||||||||||||||||||||