Sublevels & crashes

Hello all
In the last year i worked on a huge project !
and now i tried to work with sub-levels
but seems like now it crashes all the time …
is it because i am using the same landscape to streaming level ? ( copy from level1 to level2)
because separately all work fine… but when i want them both to be sub levels the engine crashes!
i cried a lot !
i need help this is the project of my life !
just super cool free game to show my emotions in events and views !
and … unreal engine dont love me so much …

so is there any suggestion why does it crash ?
maybe the level stream blueprints ?
copied landscapes ?
foliage ?

HELP !
thank you all and have a good day !

OK!!!
i got something weird happens and i thinking i know when it crashes!
when i add my two levels as sub-levels all works great …
but when i press the eye icon on the level1 it works fine
but if i also press to see level2
BAAAMMMMMM
crash … why is that so ? :open_mouth: