We're not quite sure what action triggered this, but it caused our server to crash.

Description: Exception in server tick loop

java.lang.NoSuchMethodError: baubles.common.network.PacketSync.<init>(Lnet/minecraft/entity/player/EntityPlayer;I)V
        at vazkii.botania.common.core.handler.InternalMethodHandler.sendBaubleUpdatePacket(InternalMethodHandler.java:263)
        at vazkii.botania.common.item.equipment.bauble.ItemMagnetRing.onTossItem(ItemMagnetRing.java:66)
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_743_ItemMagnetRing_onTossItem_ItemTossEvent.invoke(.dynamic)
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
        at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
        at net.minecraftforge.common.ForgeHooks.onPlayerTossEvent(ForgeHooks.java:681)
        at net.minecraft.entity.player.EntityPlayer.func_71019_a(EntityPlayer.java:711)
        at net.minecraft.inventory.Container.func_75134_a(Container.java:489)
        at net.minecraft.inventory.ContainerPlayer.func_75134_a(ContainerPlayer.java:93)
        at net.minecraft.entity.player.EntityPlayer.func_70106_y(EntityPlayer.java:1507)
        at net.minecraft.world.World.func_72900_e(World.java:1242)
        at net.minecraft.server.management.PlayerList.func_72367_e(PlayerList.java:412)
        at net.minecraft.network.NetHandlerPlayServer.func_147231_a(NetHandlerPlayServer.java:849)
        at net.minecraft.network.NetworkManager.func_179293_l(NetworkManager.java:457)
        at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:213)
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:788)
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:396)
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524)
        at java.lang.Thread.run(Thread.java:748)

Full crashlog: https://pastebin.com/vLvVeh20

All the Mods 3 modpack (version 5.7)
Baubles 1.5.2
Botania r1.10-352

Having the same problem in FTB Revelation since the 1.3.0 update which updated Baubles 1.5.1 -> 1.5.2

Let me know if it's Botania's fault...

[12:34:35] [Server thread/ERROR] [FML]: Exception caught during firing event net.minecraftforge.event.entity.item.ItemTossEvent@3a993915:
java.lang.NoSuchMethodError: baubles.common.network.PacketSync.(Lnet/minecraft/entity/player/EntityPlayer;I)V
at vazkii.botania.common.core.handler.InternalMethodHandler.sendBaubleUpdatePacket(InternalMethodHandler.java:263) ~[InternalMethodHandler.class:?]
at vazkii.botania.common.item.equipment.bauble.ItemMagnetRing.onTossItem(ItemMagnetRing.java:66) ~[ItemMagnetRing.class:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_536_ItemMagnetRing_onTossItem_ItemTossEvent.invoke(.dynamic) ~[?:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) ~[ASMEventHandler.class:?]
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179) [EventBus.class:?]
at net.minecraftforge.common.ForgeHooks.onPlayerTossEvent(ForgeHooks.java:681) [ForgeHooks.class:?]
at net.minecraft.entity.player.EntityPlayer.func_71019_a(EntityPlayer.java:711) [aed.class:?]
at net.minecraft.inventory.Container.func_75134_a(Container.java:489) [afr.class:?]
at forestry.core.gui.ContainerNaturalistInventory.func_75134_a(ContainerNaturalistInventory.java:60) [ContainerNaturalistInventory.class:?]
at net.minecraft.entity.player.EntityPlayerMP.func_71128_l(EntityPlayerMP.java:1022) [oq.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_147356_a(NetHandlerPlayServer.java:1135) [pa.class:?]
at net.minecraft.network.play.client.CPacketCloseWindow.func_148833_a(SourceFile:20) [lg.class:?]
at net.minecraft.network.play.client.CPacketCloseWindow.func_148833_a(SourceFile:8) [lg.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_141]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_141]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:721) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:396) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_141]
[12:34:35] [Server thread/ERROR] [FML]: Index: 4 Listeners:
[12:34:35] [Server thread/ERROR] [FML]: 0: NORMAL
[12:34:35] [Server thread/ERROR] [FML]: 1: ASM: vazkii.akashictome.MorphingHandler@4932dc12 onItemDropped(Lnet/minecraftforge/event/entity/item/ItemTossEvent;)V
[12:34:35] [Server thread/ERROR] [FML]: 2: ASM: vazkii.morphtool.MorphingHandler@47fc8160 onItemDropped(Lnet/minecraftforge/event/entity/item/ItemTossEvent;)V
[12:34:35] [Server thread/ERROR] [FML]: 3: ASM: jds.bibliocraft.events.EventItemToss@b9413d4 DroppedItemEvent(Lnet/minecraftforge/event/entity/item/ItemTossEvent;)V
[12:34:35] [Server thread/ERROR] [FML]: 4: ASM: vazkii.botania.common.item.equipment.bauble.ItemMagnetRing@26576f8f onTossItem(Lnet/minecraftforge/event/entity/item/ItemTossEvent;)V
[12:34:35] [Server thread/ERROR] [FML]: 5: ASM: com.rwtema.extrautils2.items.ItemUnstableIngots@28e9f97b onToss(Lnet/minecraftforge/event/entity/item/ItemTossEvent;)V

https://pastebin.com/BELefP4v

Really an issue at VazkiiMods/Botania#2509

this is already fixed in botania