Matrix warn spamming console

[14:04:53 WARN]: [Matrix] Task #35 for Matrix v2.6.10 generated an exception
java.lang.NoClassDefFoundError: org/apache/commons/lang3/Validate
        at com.comphenix.protocol.injector.netty.ChannelInjector.invokeSendPacket(ChannelInjector.java:651) ~[?:?]
        at com.comphenix.protocol.injector.netty.ChannelInjector.sendServerPacket(ChannelInjector.java:640) ~[?:?]
        at com.comphenix.protocol.injector.netty.ProtocolInjector$4.sendServerPacket(ProtocolInjector.java:403) ~[?:?]
        at com.comphenix.protocol.injector.PacketFilterManager.sendServerPacket(PacketFilterManager.java:786) ~[?:?]
        at com.comphenix.protocol.injector.PacketFilterManager.sendServerPacket(PacketFilterManager.java:740) ~[?:?]
        at me.rerere.matrix.iiIiiIIiIi.iIIIiiIiII(ji) ~[?:?]
        at me.rerere.matrix.iIIIiIIIii.run(od) ~[?:?]
        at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftTask.run(CraftTask.java:84) ~[patched_1.14.4.jar:git-Paper-187]
        at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:452) ~[patched_1.14.4.jar:git-Paper-187]
        at net.minecraft.server.v1_14_R1.MinecraftServer.b(MinecraftServer.java:1148) ~[patched_1.14.4.jar:git-Paper-187]
        at net.minecraft.server.v1_14_R1.DedicatedServer.b(DedicatedServer.java:417) ~[patched_1.14.4.jar:git-Paper-187]
        at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:1075) ~[patched_1.14.4.jar:git-Paper-187]
        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:919) ~[patched_1.14.4.jar:git-Paper-187]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]