PaperMoney - Load Error

[18:20:58] [Server thread/ERROR]: Could not load 'plugins\PaperMoney.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: me/TheTealViper/papermoney/main has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:138) ~[paper.jar:git-Paper-"b7dc6fb0"]
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:337) ~[paper.jar:git-Paper-"b7dc6fb0"]
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:257) ~[paper.jar:git-Paper-"b7dc6fb0"]
    at org.bukkit.craftbukkit.v1_14_R1.CraftServer.loadPlugins(CraftServer.java:355) ~[paper.jar:git-Paper-"b7dc6fb0"]
    at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:226) ~[paper.jar:git-Paper-"b7dc6fb0"]
    at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:870) ~[paper.jar:git-Paper-"b7dc6fb0"]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]
Caused by: java.lang.UnsupportedClassVersionError: me/TheTealViper/papermoney/main has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
    at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_181]
    at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_181]
    at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_181]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:135) ~[paper.jar:git-Paper-"b7dc6fb0"]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:85) ~[paper.jar:git-Paper-"b7dc6fb0"]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_181]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_181]
    at java.lang.Class.forName0(Native Method) ~[?:1.8.0_181]
    at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_181]
    at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:63) ~[paper.jar:git-Paper-"b7dc6fb0"]
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:134) ~[paper.jar:git-Paper-"b7dc6fb0"]
    ... 6 more