2013-02-25 23:05:34 [INFO] This error is logged only once: it could have occurred multiple times by now.
2013-02-25 23:05:34 [INFO] Potential failures may occur in other plugins handling this Event.
2013-02-25 23:05:34 [INFO] Please contact one of the authors of plugin 'Giant Trees':
2013-02-25 23:05:34 [WARNING] Could not properly handle event BLOCK_PHYSICS:
java.lang.IllegalAccessError: Synchronized code got accessed from another thread: com.connormahaffey.GiantTrees.CreateTree
    at org.bukkit.event.NLTCListener.onBlockPhysics(NLTCListener:0)
    at sun.reflect.GeneratedMethodAccessor33.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
    at net.minecraft.server.v1_4_R1.World.m(World.java:475)
    at net.minecraft.server.v1_4_R1.World.applyPhysics(World.java:461)
    at net.minecraft.server.v1_4_R1.World.update(World.java:422)
    at net.minecraft.server.v1_4_R1.World.setTypeId(World.java:399)
    at org.bukkit.craftbukkit.v1_4_R1.block.CraftBlock.setTypeId(CraftBlock.java:107)
    at org.bukkit.craftbukkit.v1_4_R1.block.CraftBlock.setType(CraftBlock.java:103)
    at uk.co.jacekk.bukkit.skylandsplus.generation.SnowPopulator.populate(SnowPopulator.java:30)
    at com.bergerkiller.bukkit.common.bases.ChunkProviderServerBase.onPopulate(ChunkProviderServerBase.java:97)
    at net.timedminecraft.server.TimedChunkProviderServer.onPopulate(TimedChunkProviderServer.java:148)
    at com.bergerkiller.bukkit.common.bases.ChunkProviderServerBase.getChunkAt(ChunkProviderServerBase.java:134)
    at net.minecraft.server.v1_4_R1.Chunk.a(Chunk.java:797)
    at net.minecraft.server.v1_4_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:143)
    at com.bergerkiller.bukkit.common.bases.ChunkProviderServerBase.getBukkitChunkAt(ChunkProviderServerBase.java:86)
    at net.timedminecraft.server.TimedChunkProviderServer.getBukkitChunkAt(TimedChunkProviderServer.java:133)
    at com.bergerkiller.bukkit.common.bases.ChunkProviderServerBase.getChunkAt(ChunkProviderServerBase.java:74)
    at net.minecraft.server.v1_4_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:85)
    at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.getChunkAt(CraftWorld.java:117)
    at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.getBlockAt(CraftWorld.java:81)
    at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.getBlockAt(CraftWorld.java:481)
    at org.bukkit.Location.getBlock(Location.java:82)
    at com.connormahaffey.GiantTrees.Build.changeBlock(Build.java:94)
    at com.connormahaffey.GiantTrees.TreeBranch.createTreeBranch(TreeBranch.java:28)
    at com.connormahaffey.GiantTrees.CreateTree.makeBranches(CreateTree.java:136)
    at com.connormahaffey.GiantTrees.CreateTree.run(CreateTree.java:85)
2013-02-25 23:05:34 [INFO] This error is logged only once: it could have occurred multiple times by now.
2013-02-25 23:05:34 [INFO] Potential failures may occur in other plugins handling this Event.
2013-02-25 23:05:34 [INFO] Please contact one of the authors of plugin 'Giant Trees':
2013-02-25 23:05:34 [WARNING] Could not properly handle event CHUNK_POPULATED:
java.lang.IllegalAccessError: Synchronized code got accessed from another thread: com.connormahaffey.GiantTrees.CreateTree
    at org.bukkit.event.NLTCListener.onChunkPopulate(NLTCListener:0)
    at sun.reflect.GeneratedMethodAccessor457.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
    at com.bergerkiller.bukkit.common.bases.ChunkProviderServerBase.getChunkAt(ChunkProviderServerBase.java:138)
    at net.minecraft.server.v1_4_R1.Chunk.a(Chunk.java:797)
    at net.minecraft.server.v1_4_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:143)
    at com.bergerkiller.bukkit.common.bases.ChunkProviderServerBase.getBukkitChunkAt(ChunkProviderServerBase.java:86)
    at net.timedminecraft.server.TimedChunkProviderServer.getBukkitChunkAt(TimedChunkProviderServer.java:133)
    at com.bergerkiller.bukkit.common.bases.ChunkProviderServerBase.getChunkAt(ChunkProviderServerBase.java:74)
    at net.minecraft.server.v1_4_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:85)
    at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.getChunkAt(CraftWorld.java:117)
    at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.getBlockAt(CraftWorld.java:81)
    at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.getBlockAt(CraftWorld.java:481)
    at org.bukkit.Location.getBlock(Location.java:82)
    at com.connormahaffey.GiantTrees.Build.changeBlock(Build.java:94)
    at com.connormahaffey.GiantTrees.TreeBranch.createTreeBranch(TreeBranch.java:28)
    at com.connormahaffey.GiantTrees.CreateTree.makeBranches(CreateTree.java:136)
    at com.connormahaffey.GiantTrees.CreateTree.run(CreateTree.java:85)