redeem

[10:04:38 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'redeem' in plugin GuiRedeemMCMMO v2.1
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[patched_1.13.2.jar:git-Paper-561]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[patched_1.13.2.jar:git-Paper-561]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.dispatchCommand(CraftServer.java:734) ~[patched_1.13.2.jar:git-Paper-561]
        at net.minecraft.server.v1_13_R2.PlayerConnection.handleCommand(PlayerConnection.java:1798) ~[patched_1.13.2.jar:git-Paper-561]
        at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:1606) ~[patched_1.13.2.jar:git-Paper-561]
        at net.minecraft.server.v1_13_R2.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[patched_1.13.2.jar:git-Paper-561]
        at net.minecraft.server.v1_13_R2.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.13.2.jar:git-Paper-561]
        at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:15) ~[patched_1.13.2.jar:git-Paper-561]
        at net.minecraft.server.v1_13_R2.PlayerConnectionUtils$$Lambda$3132.00000000A00088A0.run(Unknown Source) ~[?:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_202]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_202]
        at net.minecraft.server.v1_13_R2.SystemUtils.a(SystemUtils.java:108) ~[patched_1.13.2.jar:git-Paper-561]
        at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:1011) ~[patched_1.13.2.jar:git-Paper-561]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:439) ~[patched_1.13.2.jar:git-Paper-561]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:938) ~[patched_1.13.2.jar:git-Paper-561]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:836) ~[patched_1.13.2.jar:git-Paper-561]
        at java.lang.Thread.run(Thread.java:813) [?:1.8.0_202]
Caused by: java.lang.NoSuchFieldError: org/bukkit/Material.STAINED_GLASS_PANE
        at me.pramsing.GuiRedeemMCMMO.Main.onCommand(Main.java:480) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[patched_1.13.2.jar:git-Paper-561]
        ... 16 more