I had no issues for minecraft launcher beta using optifine. Since the snapshot came out on 2/24/2021 I am unable to run "Modded" versions of the game only pure vanilla. Attempting to run "Modded" versions of the game results in a error 0 code.
Also I tried running java 8 and 11. Made no difference as a resulting of this being a bug or broken code in the launcher making the built in java not work for "Modded" versions of the game and 100% works for Vanilla Minecraft.
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Optifine Support tweeted this <-- does that solve the problem?
"Optifine Support tweeted this <-- does that solve the problem?"
Yes, however it still a bug for Mojang since this should not be happening at all, They manage how the launcher works.
I am having the same issue. I believe it was caused by the most recent launcher update because for me it was working the day before the update applied to my launcher.
Closing, this duplicates MCL-17045.
have been having this same problem for months. It will run vanilla but not the same version with optifine.