org.bukkit.command.CommandException: Unhandled exception executing 'grant tigerboy985' in com.demeng7215.rankgrantplus.commands.GrantCmd(grant)

at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:162) ~[patched_1.12.2.jar:git-Paper-1618]

at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:685) ~[patched_1.12.2.jar:git-Paper-1618]

at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1492) ~[patched_1.12.2.jar:git-Paper-1618]

at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1297) ~[patched_1.12.2.jar:git-Paper-1618]

at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[patched_1.12.2.jar:git-Paper-1618]

at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.12.2.jar:git-Paper-1618]

at net.minecraft.server.v1_12_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:14) ~[patched_1.12.2.jar:git-Paper-1618]

at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$$Lambda$639.00000000BD0EE140.run(Unknown Source) ~[?:?]

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_212]

at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_212]

at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) ~[patched_1.12.2.jar:git-Paper-1618]

at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:850) ~[patched_1.12.2.jar:git-Paper-1618]

at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:423) ~[patched_1.12.2.jar:git-Paper-1618]

at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:774) ~[patched_1.12.2.jar:git-Paper-1618]

at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:666) ~[patched_1.12.2.jar:git-Paper-1618]

at java.lang.Thread.run(Thread.java:813) [?:1.8.0_212]

Caused by: java.lang.ArrayIndexOutOfBoundsException

at java.util.Arrays$ArrayList.set(Arrays.java:3846) ~[?:1.8.0_212]

at net.minecraft.server.v1_12_R1.NonNullList.set(SourceFile:51) ~[patched_1.12.2.jar:git-Paper-1618]

at org.bukkit.craftbukkit.v1_12_R1.inventory.CraftInventoryCustom$MinecraftInventory.setItem(CraftInventoryCustom.java:107) ~[patched_1.12.2.jar:git-Paper-1618]

at org.bukkit.craftbukkit.v1_12_R1.inventory.CraftInventory.setItem(CraftInventory.java:96) ~[patched_1.12.2.jar:git-Paper-1618]

at com.demeng7215.rankgrantplus.utils.RGPInventory.setItem(RGPInventory.java:49) ~[?:?]

at com.demeng7215.rankgrantplus.inventories.RankSelectInv.<init>(RankSelectInv.java:63) ~[?:?]

at com.demeng7215.rankgrantplus.commands.GrantCmd.run(GrantCmd.java:39) ~[?:?]

at com.demeng7215.rankgrantplus.shaded.demapi.api.DemCommand.execute(DemCommand.java:33) ~[?:?]

at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:152) ~[patched_1.12.2.jar:git-Paper-1618]

... 15 more