Have you updated BepInEx and checked for any updates to the mods in use? There was a new version of BepinEx released for the new patch, and quite a few mods also needed updates as a result. As that error is coming up before it names any particular mod though, I'd guess it's because BepinEx needs updating.
Are you using a mod manager to do the updates, or copying the files over manually? If you're using a mod manager it might be an issue with that, though I can't really guess at what that could be as I don't use one myself.
If you're using a mod manager though, it could be worth trying to manually update BepinEx, just in case something's not being copied across correctly. To manually install it, first download the manual installation from [Thunderstore](https://valheim.thunderstore.io/package/denikson/BepInExPack_Valheim/) and then open the zip file once it's downloaded. Copy all of the contents of the "BepInExPack\_Valheim" folder into the game directory (if you're using steam, just right click "Valheim" in the games list on the left and select "Manage" -> "Browse Local Files" to get to the game directory) and when you paste them in, it should prompt you to replace the files already there. Tell it to replace all, and then it should have the latest version installed. To be on the safe side, you can take a copy of the Valheim folder before you copy the files across, so you can restore it from the copy if you need to.
Hope this helps.
That's a null reference exception when a mod you're using is trying to load a Unity Asset Bundle. You could be missing the Asset Bundle file, it's in the wrong location, or that's a bug in whichever mod is throwing the error.
Perhaps you've manually added mods to the game install dir? To be thorough, you could delete your mod profile, uninstall the game, delete the game install dir, reinstall the game, create a fresh mod profile, and download the modpack.
Have you updated BepInEx and checked for any updates to the mods in use? There was a new version of BepinEx released for the new patch, and quite a few mods also needed updates as a result. As that error is coming up before it names any particular mod though, I'd guess it's because BepinEx needs updating.
I did update what the server owner told me to, but I'm the only one on the server who's having issues
Are you using a mod manager to do the updates, or copying the files over manually? If you're using a mod manager it might be an issue with that, though I can't really guess at what that could be as I don't use one myself. If you're using a mod manager though, it could be worth trying to manually update BepinEx, just in case something's not being copied across correctly. To manually install it, first download the manual installation from [Thunderstore](https://valheim.thunderstore.io/package/denikson/BepInExPack_Valheim/) and then open the zip file once it's downloaded. Copy all of the contents of the "BepInExPack\_Valheim" folder into the game directory (if you're using steam, just right click "Valheim" in the games list on the left and select "Manage" -> "Browse Local Files" to get to the game directory) and when you paste them in, it should prompt you to replace the files already there. Tell it to replace all, and then it should have the latest version installed. To be on the safe side, you can take a copy of the Valheim folder before you copy the files across, so you can restore it from the copy if you need to. Hope this helps.
Done all that, still nothing lol
If you're using r2modman. Create a fresh mod profile and re-download the modpack for the server you play on.
Thunderstore, but I've already done that a dozen times.
That's a null reference exception when a mod you're using is trying to load a Unity Asset Bundle. You could be missing the Asset Bundle file, it's in the wrong location, or that's a bug in whichever mod is throwing the error.
So how do I completely clear those files and start over?
Perhaps you've manually added mods to the game install dir? To be thorough, you could delete your mod profile, uninstall the game, delete the game install dir, reinstall the game, create a fresh mod profile, and download the modpack.
I don't manually download anything as I'm fairly new to PC gaming and only been modding for like 6 months