Config change doesn't work?

[quat1024]

1. cover yourself in oil
2. open q menu and change a config option
3. press save

java.lang.RuntimeException: Exception while firing event org.violetmoon.zeta.event.load.ZConfigChanged@298fe4f6: 
	at TRANSFORMER/[email protected]/org.violetmoon.zeta.event.bus.ZetaEventBus$Listeners.doFire(ZetaEventBus.java:229)
	at TRANSFORMER/[email protected]/org.violetmoon.zeta.event.bus.ZetaEventBus.fire(ZetaEventBus.java:103)
	at TRANSFORMER/[email protected]/org.violetmoon.zetaimplforge.config.ConfigEventDispatcher.handleConfigChange(ConfigEventDispatcher.java:31)
	at TRANSFORMER/[email protected]/org.violetmoon.zetaimplforge.config.ConfigEventDispatcher.configChanged(ConfigEventDispatcher.java:20)
	at MC-BOOTSTRAP/net.minecraftforge.eventbus/net.minecraftforge.eventbus.EventBus.doCastFilter(EventBus.java:260)
	at MC-BOOTSTRAP/net.minecraftforge.eventbus/net.minecraftforge.eventbus.EventBus.lambda$addListener$11(EventBus.java:252)
	at MC-BOOTSTRAP/net.minecraftforge.eventbus/net.minecraftforge.eventbus.EventBus.post(EventBus.java:315)
	at MC-BOOTSTRAP/net.minecraftforge.eventbus/net.minecraftforge.eventbus.EventBus.post(EventBus.java:296)
	at LAYER PLUGIN/[email protected]/net.minecraftforge.fml.javafmlmod.FMLModContainer.lambda$new$0(FMLModContainer.java:42)
	at LAYER PLUGIN/[email protected]/net.minecraftforge.fml.ModContainer.lambda$dispatchConfigEvent$13(ModContainer.java:153)
	at java.base/java.util.Optional.ifPresent(Optional.java:178)
	at LAYER PLUGIN/[email protected]/net.minecraftforge.fml.ModContainer.dispatchConfigEvent(ModContainer.java:153)
	at LAYER PLUGIN/[email protected]/net.minecraftforge.fml.config.ModConfig.fireEvent(ModConfig.java:77)
	at LAYER PLUGIN/[email protected]/net.minecraftforge.fml.config.ConfigFileTypeHandler$ConfigWatcher.run(ConfigFileTypeHandler.java:147)
	at MC-BOOTSTRAP/[email protected]/com.electronwill.nightconfig.core.file.FileWatcher$WatcherThread.run(FileWatcher.java:181)
Caused by: java.lang.IllegalArgumentException: Invalid message org.violetmoon.zeta.network.message.C2SUpdateFlag
	at TRANSFORMER/[email protected]/net.minecraftforge.network.simple.IndexedMessageCodec.build(IndexedMessageCodec.java:132)
	at TRANSFORMER/[email protected]/net.minecraftforge.network.simple.SimpleChannel.encodeMessage(SimpleChannel.java:68)
	at TRANSFORMER/[email protected]/net.minecraftforge.network.simple.SimpleChannel.toBuffer(SimpleChannel.java:81)
	at TRANSFORMER/[email protected]/net.minecraftforge.network.simple.SimpleChannel.toVanillaPacket(SimpleChannel.java:112)
	at TRANSFORMER/[email protected]/net.minecraftforge.network.simple.SimpleChannel.sendTo(SimpleChannel.java:92)
	at TRANSFORMER/[email protected]/net.minecraftforge.network.simple.SimpleChannel.sendToServer(SimpleChannel.java:87)
	at TRANSFORMER/[email protected]/org.violetmoon.zetaimplforge.network.ForgeZetaNetworkHandler.sendToServer(ForgeZetaNetworkHandler.java:98)
	at TRANSFORMER/[email protected]/org.violetmoon.zeta.client.ZetaClient.sendToServer(ZetaClient.java:73)
	at TRANSFORMER/[email protected]/org.violetmoon.zeta.client.config.ClientConfigManager.configChanged(ClientConfigManager.java:63)
	at TRANSFORMER/[email protected]/org.violetmoon.zeta.event.bus.ZetaEventBus$Listeners.doFireNonCancellable(ZetaEventBus.java:242)
	at TRANSFORMER/[email protected]/org.violetmoon.zeta.event.bus.ZetaEventBus$Listeners.doFire(ZetaEventBus.java:227)
	... 14 more

[qznfbnj]

Text below be as additional information

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See #21

[quat1024]

^ That seems like a different problem btw