my game output:

21:39:44
launcher
main
debug
Download from https://resources.download.minecraft.net/c4/c4dbabc820f04ba685694c63359429b22e3a62b5 passed checksum check.
21:39:44
launcher
main
info
Downloaded https://resources.download.minecraft.net/c4/c4dbabc820f04ba685694c63359429b22e3a62b5 to C:\Users\René\AppData\Roaming\.minecraft\assets\objects\c4\c4dbabc820f04ba685694c63359429b22e3a62b5
21:39:44
launcher
main
debug
Download from https://resources.download.minecraft.net/60/609f82ffb167c3ee30fba3df8b4333728f5ab892 passed checksum check.
21:39:44
launcher
main
info
Downloaded https://resources.download.minecraft.net/60/609f82ffb167c3ee30fba3df8b4333728f5ab892 to C:\Users\René\AppData\Roaming\.minecraft\assets\objects\60\609f82ffb167c3ee30fba3df8b4333728f5ab892
21:39:44
launcher
main
debug
All download jobs finished, canceling update timer
21:39:44
launcher
main
debug
Downloads successful
21:39:44
launcher
main
debug
And io service
21:39:44
launcher
main
debug
Done!
21:39:44
launcher
main
debug
Extracting 7 files!
21:39:44
launcher
main
info
Using default game log configuration client-1.12.xml (outputs XML)
21:39:44
launcher
main
debug
Installing versions!
21:39:44
launcher
main
info
Installed 1.14 to C:\Users\René\AppData\Roaming\.minecraft\versions\1.14\1.14.json
21:39:45
launcher
main
info
Error: Could not find or load main class net.minecraft.client.main.Main
21:39:45
monitor
Process Monitor
fatal
Process crashed with exit code 1