[23:54:07 ERROR]: [ItemsAdder] Error initializing plugin 'ItemsAdder_4.0.13-beta-8.jar' in folder 'plugins\.paper-remapped' (Is it up to date?)
java.lang.NoClassDefFoundError: net/kyori/adventure/text/serializer/gson/legacyimpl/NBTLegacyHoverEventSerializer
        at ItemsAdder_4.0.13-beta-8.jar/itemsadder.m.aom.<clinit>(SourceFile:71) ~[ItemsAdder_4.0.13-beta-8.jar:?]
        at ItemsAdder_4.0.13-beta-8.jar/itemsadder.m.ape.<clinit>(SourceFile:17) ~[ItemsAdder_4.0.13-beta-8.jar:?]
        at ItemsAdder_4.0.13-beta-8.jar/dev.lone.itemsadder.Main.onLoad(SourceFile:171) ~[ItemsAdder_4.0.13-beta-8.jar:?]
        at io.papermc.paper.plugin.storage.ServerPluginProviderStorage.processProvided(ServerPluginProviderStorage.java:59) ~[purpur-1.21.7.jar:1.21.7-2477-60bdf1c]
        at io.papermc.paper.plugin.storage.ServerPluginProviderStorage.processProvided(ServerPluginProviderStorage.java:18) ~[purpur-1.21.7.jar:1.21.7-2477-60bdf1c]
        at io.papermc.paper.plugin.storage.SimpleProviderStorage.enter(SimpleProviderStorage.java:39) ~[purpur-1.21.7.jar:1.21.7-2477-60bdf1c]
        at io.papermc.paper.plugin.entrypoint.LaunchEntryPointHandler.enter(LaunchEntryPointHandler.java:39) ~[purpur-1.21.7.jar:1.21.7-2477-60bdf1c]
        at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:580) ~[purpur-1.21.7.jar:1.21.7-2477-60bdf1c]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:269) ~[purpur-1.21.7.jar:1.21.7-2477-60bdf1c]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1179) ~[purpur-1.21.7.jar:1.21.7-2477-60bdf1c]
        at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:313) ~[purpur-1.21.7.jar:1.21.7-2477-60bdf1c]
        at java.base/java.lang.Thread.run(Unknown Source) ~[?:?]
Caused by: java.lang.ClassNotFoundException: net.kyori.adventure.text.serializer.gson.legacyimpl.NBTLegacyHoverEventSerializer
        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:205) ~[purpur-api-1.21.7-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:172) ~[purpur-api-1.21.7-R0.1-SNAPSHOT.jar:?]
        at java.base/java.lang.ClassLoader.loadClass(Unknown Source) ~[?:?]
        ... 12 more