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[16:28:04 WARN]: net.minecraft.server.v1_12_R1.ExceptionWorldConflict: Failed to check session lock for world located at ./world_nether, aborting. Stop the server and delete the session.lock in this world to prevent further issues.
[16:28:04 WARN]: at net.minecraft.server.v1_12_R1.WorldNBTStorage.checkSession(WorldNBTStorage.java:85)
[16:28:04 WARN]: at net.minecraft.server.v1_12_R1.World.checkSession(World.java:3006)
[16:28:04 WARN]: at net.minecraft.server.v1_12_R1.WorldServer.a(WorldServer.java:1109)
[16:28:04 WARN]: at net.minecraft.server.v1_12_R1.WorldServer.save(WorldServer.java:1074)
[16:28:04 WARN]: at org.bukkit.craftbukkit.v1_12_R1.CraftWorld.save(CraftWorld.java:823)
[16:28:04 WARN]: at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:818)
[16:28:04 WARN]: at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:678)
[16:28:04 WARN]: at java.lang.Thread.run(Thread.java:748)
[16:28:04 WARN]: net.minecraft.server.v1_12_R1.ExceptionWorldConflict: Failed to check session lock for world located at ./world_the_end, aborting. Stop the server and delete the session.lock in this world to prevent further issues.
[16:28:04 WARN]: at net.minecraft.server.v1_12_R1.WorldNBTStorage.checkSession(WorldNBTStorage.java:85)
[16:28:04 WARN]: at net.minecraft.server.v1_12_R1.World.checkSession(World.java:3006)
[16:28:04 WARN]: at net.minecraft.server.v1_12_R1.WorldServer.a(WorldServer.java:1109)
[16:28:04 WARN]: at net.minecraft.server.v1_12_R1.WorldServer.save(WorldServer.java:1074)
[16:28:04 WARN]: at org.bukkit.craftbukkit.v1_12_R1.CraftWorld.save(CraftWorld.java:823)
[16:28:04 WARN]: at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:818)
[16:28:04 WARN]: at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:678)
[16:28:04 WARN]: at java.lang.Thread.run(Thread.java:748)
[16:28:04 ERROR]: [global] TIMING_STACK_CORRUPTION - Report this to the plugin Minecraft(Look for errors above this in the logs) (TimingIdentifier{id=Minecraft:world_the_end - World Save - Level} did not stopTiming)
java.lang.Throwable: null
at co.aikar.timings.TimingHandler.stopTiming(TimingHandler.java:114) ~[nxylsrv.jar:git-Paper-33d42c8e]
at co.aikar.timings.FullServerTickHandler.stopTiming(FullServerTickHandler.java:29) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:847) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:678) ~[nxylsrv.jar:git-Paper-33d42c8e]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]
[16:28:04 ERROR]: [global] TIMING_STACK_CORRUPTION - Report this to the plugin Minecraft(Look for errors above this in the logs) (TimingIdentifier{id=Minecraft:world_the_end - World Save} did not stopTiming)
java.lang.Throwable: null
at co.aikar.timings.TimingHandler.stopTiming(TimingHandler.java:114) ~[nxylsrv.jar:git-Paper-33d42c8e]
at co.aikar.timings.FullServerTickHandler.stopTiming(FullServerTickHandler.java:29) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:847) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:678) ~[nxylsrv.jar:git-Paper-33d42c8e]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]
[16:28:04 ERROR]: [global] TIMING_STACK_CORRUPTION - Report this to the plugin Minecraft(Look for errors above this in the logs) (TimingIdentifier{id=Minecraft:world_nether - World Save - Level} did not stopTiming)
java.lang.Throwable: null
at co.aikar.timings.TimingHandler.stopTiming(TimingHandler.java:114) ~[nxylsrv.jar:git-Paper-33d42c8e]
at co.aikar.timings.FullServerTickHandler.stopTiming(FullServerTickHandler.java:29) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:847) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:678) ~[nxylsrv.jar:git-Paper-33d42c8e]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]
[16:28:04 ERROR]: [global] TIMING_STACK_CORRUPTION - Report this to the plugin Minecraft(Look for errors above this in the logs) (TimingIdentifier{id=Minecraft:world_nether - World Save} did not stopTiming)
java.lang.Throwable: null
at co.aikar.timings.TimingHandler.stopTiming(TimingHandler.java:114) ~[nxylsrv.jar:git-Paper-33d42c8e]
at co.aikar.timings.FullServerTickHandler.stopTiming(FullServerTickHandler.java:29) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:847) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:678) ~[nxylsrv.jar:git-Paper-33d42c8e]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]
[16:28:05 ERROR]: Couldn't save chunk; already in use by another instance of Minecraft?
net.minecraft.server.v1_12_R1.ExceptionWorldConflict: Failed to check session lock for world located at ./world_the_end, aborting. Stop the server and delete the session.lock in this world to prevent further issues.
at net.minecraft.server.v1_12_R1.WorldNBTStorage.checkSession(WorldNBTStorage.java:85) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.World.checkSession(World.java:3006) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.ChunkRegionLoader.saveChunk(ChunkRegionLoader.java:152) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.ChunkProviderServer.saveChunk(ChunkProviderServer.java:257) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.ChunkProviderServer.a(ChunkProviderServer.java:317) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.WorldServer.save(WorldServer.java:1081) ~[nxylsrv.jar:git-Paper-33d42c8e]
at org.bukkit.craftbukkit.v1_12_R1.CraftWorld.save(CraftWorld.java:823) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:818) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:678) ~[nxylsrv.jar:git-Paper-33d42c8e]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]
[16:28:05 ERROR]: Couldn't save chunk; already in use by another instance of Minecraft?
net.minecraft.server.v1_12_R1.ExceptionWorldConflict: Failed to check session lock for world located at ./world_the_end, aborting. Stop the server and delete the session.lock in this world to prevent further issues.
at net.minecraft.server.v1_12_R1.WorldNBTStorage.checkSession(WorldNBTStorage.java:85) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.World.checkSession(World.java:3006) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.ChunkRegionLoader.saveChunk(ChunkRegionLoader.java:152) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.ChunkProviderServer.saveChunk(ChunkProviderServer.java:257) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.ChunkProviderServer.a(ChunkProviderServer.java:317) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.WorldServer.save(WorldServer.java:1081) ~[nxylsrv.jar:git-Paper-33d42c8e]
at org.bukkit.craftbukkit.v1_12_R1.CraftWorld.save(CraftWorld.java:823) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:818) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:678) ~[nxylsrv.jar:git-Paper-33d42c8e]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]
[16:28:05 ERROR]: Couldn't save chunk; already in use by another instance of Minecraft?
net.minecraft.server.v1_12_R1.ExceptionWorldConflict: Failed to check session lock for world located at ./world_the_end, aborting. Stop the server and delete the session.lock in this world to prevent further issues.
at net.minecraft.server.v1_12_R1.WorldNBTStorage.checkSession(WorldNBTStorage.java:85) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.World.checkSession(World.java:3006) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.ChunkRegionLoader.saveChunk(ChunkRegionLoader.java:152) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.ChunkProviderServer.saveChunk(ChunkProviderServer.java:257) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.ChunkProviderServer.a(ChunkProviderServer.java:317) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.WorldServer.save(WorldServer.java:1081) ~[nxylsrv.jar:git-Paper-33d42c8e]
at org.bukkit.craftbukkit.v1_12_R1.CraftWorld.save(CraftWorld.java:823) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:818) ~[nxylsrv.jar:git-Paper-33d42c8e]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:678) ~[nxylsrv.jar:git-Paper-33d42c8e]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]