[1.19.2] Custom mod runs fine locally but fails on server

[Gedeon]

I'm running into what I'm sure is a pretty novice issue but I cannot find the help that I need in past posts. I've created a mod that I've tested well on my local mc instance. However, it fails to load (server crashes on load) when trying to use it in on a brand new forge 1.19.2-43.2.0 server with a friend. The pain point is clearly a SoundInstance, and the only sound I've added is a custom song that plays upon entry to the nether (works fine on local mc).

FML: 43.2
        Forge: net.minecraftforge:43.2.0[22:36:38] [main/ERROR] [minecraft/Main]: Failed to start the minecraft server
net.minecraftforge.fml.LoadingFailedException: Loading errors encountered: [
        First Mod (firstmod) has failed to load correctly
?7java.lang.RuntimeException: Attempted to load class net/minecraft/client/resources/sounds/SoundInstance for invalid dist DEDICATED_SERVER
]

As I understand from similar issues by folks in the modding community, this is due to a client mod/feature on the dedicated server? However, I have MANY server-side features, such as custom blocks, weapons, structures, etc. Any help would be much appreciated, thanks.

[KoloBear]

Definitely sounds like you're not registering things on the right sides.

Here is a reference: https://docs.minecraftforge.net/en/1.19.2/concepts/sides/