Information

Minecraft version: 1.16.1
Forge version: 32.0.98
Environment: Singleplayer

Mod name: Name Tag Tweaks
Mod version: 1.16-1.1

Description

The game displays an error screen upon loading, with the following message:

Name Tag Tweaks (nametagtweaks) has failed to load correctly
Method public void com.natamus.nametagtweaks.Main.registerCommands(net.minecraftforge.event.RegisterCommandsEvent) has @SubscribeEvent annotation, but takes an argument that is not a subtype of the base type interface

Crash report

Technically not a crash, but: latest.log

Just had basically the same error with a different mod, so maybe it could be a problem in Forge?

It was indeed something Forge changed, but it has been fixed in the latest file for Minecraft 1.16.2. Thanks for opening the issue and the interest!
https://www.curseforge.com/minecraft/mc-mods/name-tag-tweaks/files