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Well, a bit more information about what you're trying to do would be helpful. e.g. why you're trying to use "INVOKE_ASSIGN" instead of "INVOKE". "INVOKE_ASSIGN" calls your code after the "target" is called and its value is stored, if applicable. "INVOKE" calls your code before the target is called. "target" expects a fully qualified name, as per the SpongePowered docs, if that name is going to be remapped (which it will be if your injecting into Minecraft itself and not another mod). For more information on fully qualified names versus canonical names, see the Java specifications. Here's an example of a working "@At" from my own code that targets the "getClosestsVulnerablePlayerToEntity" call inside a mob's logic: @At(value = "INVOKE_ASSIGN", target = "net.minecraft.world.World.getClosestVulnerablePlayerToEntity(Lnet/minecraft/entity/Entity;D)Lnet/minecraft/entity/player/EntityPlayer;") Hope this helps!