[17:48:38 ERROR]: [ProtocolLib] INTERNAL ERROR: Cannot compile structure. Disabing compiler.
If this problem hasn't already been reported, please open a ticket
at https://github.com/dmulloy2/ProtocolLib/issues with the following data:
Stack Trace:
java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @5f6efe11
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
at com.comphenix.protocol.reflect.compiler.StructureCompiler.generateClass(StructureCompiler.java:299)
at com.comphenix.protocol.reflect.compiler.StructureCompiler.compile(StructureCompiler.java:213)
at com.comphenix.protocol.reflect.compiler.BackgroundCompiler$2.call(BackgroundCompiler.java:204)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
at java.base/java.lang.Thread.run(Thread.java:831)
Dump:
Parameters:
com.comphenix.protocol.reflect.StructureModifier@41731776[
targetType=class net.minecraft.server.v1_16_R3.PacketPlayInFlying$PacketPlayInPositionLook
target=
converter=
fieldType=class java.lang.Object
data=[public double net.minecraft.server.v1_16_R3.PacketPlayInFlying.x, public double net.minecraft.server.v1_16_R3.PacketPlayInFlying.y, public double net.minecraft.server.v1_16_R3.PacketPlayInFlying.z, public float net.minecraft.server.v1_16_R3.PacketPlayInFlying.yaw, public float net.minecraft.server.v1_16_R3.PacketPlayInFlying.pitch, protected boolean net.minecraft.server.v1_16_R3.PacketPlayInFlying.f, public boolean net.minecraft.server.v1_16_R3.PacketPlayInFlying.hasPos, public boolean net.minecraft.server.v1_16_R3.PacketPlayInFlying.hasLook]
defaultFields={}
subtypeCache={}
customConvertHandling=false
useStructureCompiler=true
]
manager:
com.comphenix.protocol.injector.PacketFilterManager@7c94c0c9[
unhookTask=com.comphenix.protocol.injector.DelayedSingleTask@6da22a8f
packetListeners=[com.comphenix.protocol.async.NullPacketListener@129494bc, com.comphenix.protocol.async.NullPacketListener@788f3bf6, com.comphenix.protocol.async.NullPacketListener@1b0f8db4]
packetInjector=com.comphenix.protocol.injector.netty.ProtocolInjector$5@3a0c9dd7
playerInjection=com.comphenix.protocol.injector.netty.ProtocolInjector$4@639de547
inputBufferedPackets=[ENTITY_ACTION[class=PacketPlayInEntityAction, id=28], STEER_VEHICLE[class=PacketPlayInSteerVehicle, id=29], POSITION[class=PacketPlayInPosition, id=18], POSITION_LOOK[class=PacketPlayInPositionLook, id=19]]
recievedListeners=com.comphenix.protocol.injector.SortedPacketListenerList@39d5e375
sendingListeners=com.comphenix.protocol.injector.SortedPacketListenerList@455f4092
hasClosed=false
classLoader=PluginClassLoader{plugin=ProtocolLib v4.6.0, pluginEnabled=true, url=plugins\ProtocolLib.jar}
reporter=com.comphenix.protocol.ProtocolLib$1@1b638fcb
server=CraftServer{serverName=Paper,serverVersion=git-Paper-715,minecraftVersion=1.16.5}
library=ProtocolLib v4.6.0
asyncFilterManager=com.comphenix.protocol.async.AsyncFilterManager@18061f8
knowsServerPackets=true
knowsClientPackets=true
phaseLoginCount=0
phasePlayingCount=3
packetCreation=false
nettyInjector=com.comphenix.protocol.injector.netty.ProtocolInjector@6b4a6427
pluginVerifier=com.comphenix.protocol.injector.PluginVerifier@72e3e37e
hasRecycleDistance=true
minecraftVersion=(MC: 1.16.5)
debug=false
]
Sender:
com.comphenix.protocol.reflect.compiler.BackgroundCompiler@3a6f5e9f[
listeners={com.comphenix.protocol.reflect.compiler.StructureCompiler$StructureKey@90c70871=[com.comphenix.protocol.injector.StructureCache$1@69c1d3e3]}
listenerLock=java.lang.Object@5192e9a0
compiler=com.comphenix.protocol.reflect.compiler.StructureCompiler@3c8708ff
enabled=false
shuttingDown=false
executor=java.util.concurrent.Executors$FinalizableDelegatedExecutorService@7c5c2256
reporter=com.comphenix.protocol.ProtocolLib$1@1b638fcb
unknownPermGenBean=java.lang.Object@1b65a8f5
permGenBean=
disablePermGenFraction=0.65
]
Version:
ProtocolLib v4.6.0
Java Version:
16.0.1
Server:
git-Paper-715 (MC: 1.16.5)

Duplicate of #1162

This issue was resolved in build 499+.