Hi! I found my problem after weeks, I had to debug all day.
First, I deleted some files in the project folder for testing purposes to understand what causes crash on launch. After a couple of tryings, I found it was casued by Level1.umap
I deleted this file, my project opened, imported back and open the level, it crashed again.
So I opened a new project, imported that Level1. And started to testing by deleting some parts on the Level. After lots of tryings, I found it there was duplicated Directional Light. I don’t know how this happened but Level1 have “Directional Light” and “Directional Light - WORK TESTING ONLY”, so I deleted work testing one and the problem has gone.
TLDR; Don’t duplicate, scale, or change world position (0,0,0) of Directional Light. Also you can check your other lights.
Hope it helps.