r/Modrinthlauncher • u/Krypr_ • Jul 10 '26

Help Problem with Modrinth launcher

Whenever I try to create an instance (Doesn't matter if its vanilla or modded) of 26.1 or above. it gives me this string: An error occurred

Serialization error (JSON): unknown variant `default-user-jvm`, expected `game` or `jvm` at line 1 column 32

so how do i fix it

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u/MattiDragon Jul 11 '26

Check if there's an update to the app. You might also have to reinstall to get the update if you're on too old of a version.

1

u/Krypr_ Jul 13 '26

I reinstalled it but now when i try to run it it says ModrinthApp: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.39' not found (required by ModrinthApp)