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    Expert tip

    The server rejects all jars that already belong to the server runtime (such as tomcat-**.jar, servlet**.jar). Consider substituting the CORS filter you're using for this one: https://goo.gl/ctQ7Fs

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    This is thrown when the Java Virtual Machine (JVM) tries to load a particular class and the specified class cannot be found in the classpath. If you are using a Java version less than 8, upgrade because java.util.Base64 only comes with > Java 8.

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org.bukkit.event.EventException at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)[Spigot.jar:git-PaperSpigot-"8b18730"] at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78)[Spigot.jar:git-PaperSpigot-"8b18730"] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)[Spigot.jar:git-PaperSpigot-"8b18730"] at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501)[Spigot.jar:git-PaperSpigot-"8b18730"] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486)[Spigot.jar:git-PaperSpigot-"8b18730"] at fr.xephi.authme.service.BukkitService.callEvent(BukkitService.java:281)[?:?] at fr.xephi.authme.process.login.ProcessSyncPlayerLogin.processPlayerLogin(ProcessSyncPlayerLogin.java:90)[?:?] at fr.xephi.authme.process.SyncProcessManager.lambda$processSyncPlayerLogin$3(SyncProcessManager.java:51)[?:?] at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:59)[Spigot.jar:git-PaperSpigot-"8b18730"] at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:349)[Spigot.jar:git-PaperSpigot-"8b18730"] at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:783)[Spigot.jar:git-PaperSpigot-"8b18730"] at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378)[Spigot.jar:git-PaperSpigot-"8b18730"] at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:713)[Spigot.jar:git-PaperSpigot-"8b18730"] at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:616)[Spigot.jar:git-PaperSpigot-"8b18730"] at java.lang.Thread.run(Thread.java:748)[?:1.8.0_131]Caused by: java.lang.NoClassDefFoundError: fr/xephi/authme/api/API at ovh.minex.hooks.AuthMe.onPlayerJoin(AuthMe.java)[?:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[?:1.8.0_131] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[?:1.8.0_131] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[?:1.8.0_131] at java.lang.reflect.Method.invoke(Method.java:498)[?:1.8.0_131] at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300)[Spigot.jar:git-PaperSpigot-"8b18730"] ... 14 moreCaused by: java.lang.ClassNotFoundException: fr.xephi.authme.api.API at java.net.URLClassLoader.findClass(URLClassLoader.java:381)[?:1.8.0_131] at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:102)[Spigot.jar:git-PaperSpigot-"8b18730"] at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:87)[Spigot.jar:git-PaperSpigot-"8b18730"] at java.lang.ClassLoader.loadClass(ClassLoader.java:424)[?:1.8.0_131] at java.lang.ClassLoader.loadClass(ClassLoader.java:357)[?:1.8.0_131] ... 20 more