Internal error when trying to use BuildPaste plugin.

Any help would be much appreciated! I dropped the error message from the console down below.

Code:

[15:04:07] [Server thread/INFO]: ToastyKoro issued server command: /paste
[15:04:07] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'paste' in plugin BuildPaste v1.9.1
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[bukkit-1.20.1-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:148) ~[bukkit-1.20.1-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.v1_20_R1.CraftServer.dispatchCommand(CraftServer.java:853) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at org.bukkit.craftbukkit.v1_20_R1.command.BukkitCommandWrapper.run(BukkitCommandWrapper.java:50) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:265) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:?]
        at net.minecraft.commands.CommandDispatcher.performCommand(CommandDispatcher.java:314) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.commands.CommandDispatcher.a(CommandDispatcher.java:298) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1924) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.server.network.PlayerConnection.lambda$18(PlayerConnection.java:1886) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.util.thread.IAsyncTaskHandler.b(SourceFile:67) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?]
        at net.minecraft.server.TickTask.run(SourceFile:18) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.util.thread.IAsyncTaskHandler.d(SourceFile:156) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.util.thread.IAsyncTaskHandlerReentrant.d(SourceFile:23) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1111) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:1) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.util.thread.IAsyncTaskHandler.x(SourceFile:130) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.server.MinecraftServer.bg(MinecraftServer.java:1090) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1083) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.util.thread.IAsyncTaskHandler.c(SourceFile:139) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.server.MinecraftServer.p_(MinecraftServer.java:1067) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:985) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:296) ~[craftbukkit-1.20.1-R0.1-SNAPSHOT.jar:3825-Bukkit-202fc5c]
        at java.lang.Thread.run(Thread.java:1623) ~[?:?]
Caused by: java.lang.NoClassDefFoundError: net/md_5/bungee/api/chat/BaseComponent
        at de.mistrx.buildpaste.commands.PasteCommand.onCommand(PasteCommand.java:22) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[bukkit-1.20.1-R0.1-SNAPSHOT.jar:?]
        ... 23 more
Caused by: java.lang.ClassNotFoundException: net.md_5.bungee.api.chat.BaseComponent
        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:147) ~[bukkit-1.20.1-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:99) ~[bukkit-1.20.1-R0.1-SNAPSHOT.jar:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[?:?]
        at de.mistrx.buildpaste.commands.PasteCommand.onCommand(PasteCommand.java:22) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[bukkit-1.20.1-R0.1-SNAPSHOT.jar:?]
        ... 23 more

Screenshot from console: