ZombieSurvival error 1.14

Error occurred while enabling ZombieSurvival v6.7 (Is it up to date?)
java.lang.NoClassDefFoundError: org/apache/commons/codec/binary/StringUtils
        at sv.file14.zombiesurvival.IiIiIiiIIiIIIIIIIIIIí.<init>(Unknown Souce) ~[?:?]
        at sv.file14.zombiesurvival.Core.onEnable(Unknown Source) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263)         at sv.file14.zombiesurvival.IiIiIiiIIiIIIIIIIIIIí.<init>(Unknown Source) ~[??]
        at sv.file14.zombiesurvival.Core.onEnable(Unknown Source) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[patched_1.14.3.jar:git-Paper-115]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:338) ~[patched_1.14.3.jar:git-Paper-115]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:419) ~[patched_1.14.3.jar:git-Paper-115]
        at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugin(CraftServer.java:464) ~[patched_1.14.3.jar:git-Paper-115]
        at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugins(CraftServer.java:378) ~[patched_1.14.3.jar:git-Paper-115]
        at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:464) ~[patched_1.14.3.jar:git-Paper-115]
        at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:282) ~[patched_1.14.3.jar:git-Paper-115]
        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:859) ~[patched_1.14.3.jar:git-Paper-115]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_202]
Caused by: java.lang.ClassNotFoundException: org.apache.commons.codec.binary.StringUtils
        at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_202]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:139) ~[patched_1.14.3.jar:git-Paper-115]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:85) ~[patched_1.14.3.jar:git-Paper-115]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_202]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_202]
        ... 11 more