I keep getting the following warnings which do not stop me from starting the game. I'm launching it through MultiMC 5 - Version 0.6.11-1430. Fabric version 0.6.1.51. Autoconfig version 3.3.1.

[10:14:23] [main/INFO]: Loading for game Minecraft 1.16.4
[10:14:23] [ForkJoinPool-1-worker-3/WARN]: The mod "autoconfig1u" contains invalid entries in its mod json:
...
[10:14:23] [ForkJoinPool-1-worker-6/WARN]: The mod "autoconfig1u" contains invalid entries in its mod json:
- Unsupported root entry "$schema" at line 2 column 14
...
[10:14:23] [ForkJoinPool-1-worker-4/WARN]: The mod "autoconfig1u" contains invalid entries in its mod json:
- Unsupported root entry "$schema" at line 2 column 14
[10:14:23] [ForkJoinPool-1-worker-1/WARN]: The mod "autoconfig1u" contains invalid entries in its mod json:
- Unsupported root entry "$schema" at line 2 column 14

In case it's relevant, the ellipsis marks above are similar warnings related to cardinal components. With those the erroneous root entry is "side."

just ignore