[Client thread/WARN] [Alfheim]: Something (likely another mod) has attempted to modify the world's state from the wrong thread!
This is *bad practice* and can cause severe issues in your game.
Alfheim has done as best as it can to mitigate this violation, but it may negatively impact performance or introduce stalls.
In a future release, this violation may result in a hard crash instead of the current soft warning.
You should report this issue to our issue tracker with the following stacktrace information.

java.lang.IllegalAccessException: World is owned by 'Server thread' (ID: 203), but was accessed from thread 'Client thread' (ID: 1)
	at dev.redstudio.alfheim.lighting.LightingEngine.lock(LightingEngine.java:206) [LightingEngine.class:?]
	at dev.redstudio.alfheim.lighting.LightingEngine.processLightUpdatesForType(LightingEngine.java:180) [LightingEngine.class:?]
	at net.minecraft.world.chunk.Chunk.getLightFor(Chunk.java:2295) [axw.class:?]
	at net.minecraft.world.World.getLightFor(World.java:859) [amu.class:?]
	at net.minecraft.world.World.alfheim$getLight(World.java:6661) [amu.class:?]
	at net.minecraft.block.Block.alfheim$getLightFor(Block.java:2766) [aow.class:?]
	at net.minecraft.block.state.BlockStateContainer$StateImplementation.alfheim$getLightFor(BlockStateContainer.java:632) [awu$a.class:?]
	at net.minecraft.world.World.getLightFromNeighborsFor(World.java:6651) [amu.class:?]
	at net.minecraft.world.World.getCombinedLight(World.java:887) [amu.class:?]
	at net.minecraft.client.particle.Particle.getBrightnessForRender(Particle.java:344) [btf.class:?]
	at net.minecraft.client.particle.Particle.renderParticle(Particle.java:189) [btf.class:?]
	at net.minecraft.client.particle.ParticleCrit.renderParticle(SourceFile:45) [bsn.class:?]
	at slimeknights.tconstruct.shared.client.ParticleEffect.renderParticle(ParticleEffect.java:74) [ParticleEffect.class:?]
	at net.minecraft.client.particle.ParticleManager.redirect$zbk000$particleculling$maybeCullLitParticle(ParticleManager.java:686) [btg.class:?]
	at net.minecraft.client.particle.ParticleManager.renderLitParticles(ParticleManager.java:451) [btg.class:?]
	at net.minecraft.client.renderer.EntityRenderer.renderWorldPass(EntityRenderer.java:1869) [buq.class:?]
	at net.minecraft.client.renderer.EntityRenderer.renderWorld(EntityRenderer.java:1621) [buq.class:?]
	at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1390) [buq.class:?]
	at net.minecraft.client.Minecraft.runGameLoop(MinecraftAccessor.java:1119) [bib.class:?]
	at net.minecraft.client.Minecraft.run(MinecraftAccessor.java:8614) [bib.class:?]
	at net.minecraft.client.main.Main.main(SourceFile:123) [Main.class:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_411]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_411]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_411]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_411]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_411]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_411]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_411]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_411]
	at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:243) [NewLaunch.jar:?]
	at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:278) [NewLaunch.jar:?]
	at org.multimc.EntryPoint.listen(EntryPoint.java:143) [NewLaunch.jar:?]
	at org.multimc.EntryPoint.main(EntryPoint.java:34) [NewLaunch.jar:?]