Cannot find target for @Shadow field

[AlgorithmLX]

Hello! I have a problem with creating a mixin.

My Mixin Class:

@Mixin(SystemToast.Type.class)
@Unique
public class TypeMixin {
    @Shadow
    @Final
    @Mutable
    private static SystemToast.Type[] $VALUES;

    private static final SystemToast.Type TEST_TOAST = biscuitstory$addValue("TEST_TOAST");

    @Invoker("<init>")
    public static SystemToast.Type biscuit$invokeInit(String par1, int par2) {
        throw new AssertionError();
    }

    private static SystemToast.Type biscuit$addValue(String enid) {
        ArrayList<SystemToast.Type> storyvalues = new ArrayList<>(Arrays.asList(TypeMixin.$VALUES));
        SystemToast.Type toastType = biscuit$invokeInit(enid, storyvalues.get(storyvalues.size() -1).ordinal() + 1);
        storyvalues.add(toastType);
        TypeMixin.$VALUES = storyvalues.toArray(new SystemToast.Type[0]);
        return toastType;
    }
}

Warning in gradle: warning: Cannot find target for @Shadow field in net.minecraft.client.gui.toasts.SystemToast$Type What should I do?

[Mumfrey]

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