This is what it says when i boot it. I tried to change the version of the plugin, but still the same issue. If the problem is mine, im sorry for disturbing,
===== STACK TRACE =====
java.lang.NoClassDefFoundError: Could not initialize class com.comphenix.protocol.utility.MinecraftReflection
at com.comphenix.protocol.injector.packet.PacketRegistry.initialize(PacketRegistry.java:78)
at com.comphenix.protocol.injector.packet.PacketRegistry.getPacketClassFromType(PacketRegistry.java:356)
at com.comphenix.protocol.utility.ChatExtensions.getJsonFormatConstructor(ChatExtensions.java:218)
at com.comphenix.protocol.utility.ChatExtensions.(ChatExtensions.java:56)
at com.comphenix.protocol.ProtocolLibrary.onEnable(ProtocolLibrary.java:377)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:332)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:407)
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:369)
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:328)
at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:191)
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:526)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.NoSuchMethodError: 'com.google.common.cache.Cache com.google.common.cache.CacheBuilder.build(com.google.common.cache.CacheLoader)' [in thread "Server thread"]
at com.comphenix.protocol.utility.MinecraftReflection.(MinecraftReflection.java:155)
at com.comphenix.protocol.injector.PacketFilterManager.(PacketFilterManager.java:259)
at com.comphenix.protocol.injector.PacketFilterBuilder.buildInternal(PacketFilterBuilder.java:250)
at com.comphenix.protocol.injector.PacketFilterBuilder.build(PacketFilterBuilder.java:233)
at com.comphenix.protocol.ProtocolLibrary.onLoad(ProtocolLibrary.java:216)
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.java:308)
at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:190)
... 2 more
===== DUMP =====
Sender:
com.comphenix.protocol.ProtocolLibrary@772232fb[
statistisc=
backgroundCompiler=
packetTask=-1
tickCounter=0
unhookTask=com.comphenix.protocol.injector.DelayedSingleTask@7c11acd3
configExpectedMod=-1
updater=com.comphenix.protocol.metrics.Updater@6575a1d1
logger=org.bukkit.plugin.PluginLogger@a4467b1
redirectHandler=
commandProtocol=
commandPacket=
commandFilter=
skipDisable=false
isEnabled=true
loader=org.bukkit.plugin.java.JavaPluginLoader@440f86d3
server=CraftServer{serverName=Spigot,serverVersion=1.8.8-R0.1-SNAPSHOT,minecraftVersion=1.8.8}
file=plugins\ProtocolLib-3.4.0.jar
description=org.bukkit.plugin.PluginDescriptionFile@2f4193d3
dataFolder=plugins\ProtocolLib
classLoader=org.bukkit.plugin.java.PluginClassLoader@27df5f6f
naggable=true
ebean=
newConfig=YamlConfiguration[path='', root='YamlConfiguration']
configFile=plugins\ProtocolLib\config.yml
logger=org.bukkit.plugin.PluginLogger@a4467b1
]
Version:
ProtocolLib v3.4.0
Server:
1.8.8-R0.1-SNAPSHOT (MC: 1.8.8)

Please update to a more recent version of ProtocolLib (https://ci.dmulloy2.net/job/ProtocolLib/lastSuccessfulBuild/artifact/target/ProtocolLib.jar) to get support (v3.4 is very old and unsupported)