This started happening in 1.14 Pre-release 4, but I filing this because it is still happening in 1.14 Pre-release 5.
After trying several different things, I went so far as to reinstall my operating system, and reinstall Minecraft.
After I open the launcher and click the Play button, the Mojang flash screen appears, and the loading bar gets to about half full, then stops and the game crashes.
If I launch the 1.13 version it works.
I attached a copy of the crash report log.
Thanks!
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[media]
Duplicate of MC-148461