Dynmap SkinRestorer ERROR

[08:05:07] [Server thread/INFO]: [dynmap] Enabling dynmap v3.1-beta7-449*
[08:05:07] [Server thread/INFO]: [dynmap] Using LuckPerms 5.1.98 for access control
[08:05:07] [Server thread/ERROR]: Error occurred while enabling dynmap v3.1-beta7-449 (Is it up to date?)
java.lang.NoClassDefFoundError: skinsrestorer/bukkit/SkinsRestorer
    at org.dynmap.bukkit.DynmapPlugin.onEnable(DynmapPlugin.java:914) ~[?:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[patched_1.16.4.jar:git-Yatopia-"99e3c5d"]
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:380) ~[patched_1.16.4.jar:git-Yatopia-"99e3c5d"]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:483) ~[patched_1.16.4.jar:git-Yatopia-"99e3c5d"]
    at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugin(CraftServer.java:501) ~[patched_1.16.4.jar:git-Yatopia-"99e3c5d"]
    at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugins(CraftServer.java:415) ~[patched_1.16.4.jar:git-Yatopia-"99e3c5d"]
    at net.minecraft.server.v1_16_R3.MinecraftServer.loadWorld(MinecraftServer.java:466) ~[patched_1.16.4.jar:git-Yatopia-"99e3c5d"]
    at net.minecraft.server.v1_16_R3.DedicatedServer.init(DedicatedServer.java:259) ~[patched_1.16.4.jar:git-Yatopia-"99e3c5d"]
    at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:943) ~[patched_1.16.4.jar:git-Yatopia-"99e3c5d"]
    at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:175) ~[patched_1.16.4.jar:git-Yatopia-"99e3c5d"]
    at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: java.lang.ClassNotFoundException: skinsrestorer.bukkit.SkinsRestorer
    at java.net.URLClassLoader.findClass(URLClassLoader.java:471) ~[?:?]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:182) ~[patched_1.16.4.jar:git-Yatopia-"99e3c5d"]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:111) ~[patched_1.16.4.jar:git-Yatopia-"99e3c5d"]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:589) ~[?:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[?:?]
    ... 11 more
[08:05:07] [Server thread/INFO]: [dynmap] Disabling dynmap v3.1-beta7-449