[1.14.4] Client crash while loading

[sideswipeBL]

Windows 7, game crashes almost instantly after launching with this error:

java.lang.RuntimeException: Could not execute entrypoint stage 'client' due to errors!

Console log is nowhere to be seen. Here is a crash report instead.

crash-2020-01-12_10.40.14-client.txt

Contents of raa.json5 are
{
"materialNumber": 100,
"debug": false,
"regen": false,
"namingLanguage": "ENGLISH"
}

No other config files were created before it crashed.