error

[08:48:41 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'papi' in plugin PlaceholderAPI v2.9.2
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[patched_1.13.2.jar:git-Paper-507]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[patched_1.13.2.jar:git-Paper-507]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.dispatchCommand(CraftServer.java:732) ~[patched_1.13.2.jar:git-Paper-507]
        at net.minecraft.server.v1_13_R2.PlayerConnection.handleCommand(PlayerConnection.java:1796) ~[patched_1.13.2.jar:git-Paper-507]
        at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:1604) ~[patched_1.13.2.jar:git-Paper-507]
        at net.minecraft.server.v1_13_R2.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[patched_1.13.2.jar:git-Paper-507]
        at net.minecraft.server.v1_13_R2.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.13.2.jar:git-Paper-507]
        at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:13) ~[patched_1.13.2.jar:git-Paper-507]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_192]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_192]
        at net.minecraft.server.v1_13_R2.SystemUtils.a(SystemUtils.java:108) ~[patched_1.13.2.jar:git-Paper-507]
        at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:1011) ~[patched_1.13.2.jar:git-Paper-507]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:439) ~[patched_1.13.2.jar:git-Paper-507]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:938) ~[patched_1.13.2.jar:git-Paper-507]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:836) ~[patched_1.13.2.jar:git-Paper-507]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_192]
Caused by: java.lang.NullPointerException
        at org.bukkit.ChatColor.translateAlternateColorCodes(ChatColor.java:324) ~[patched_1.13.2.jar:git-Paper-507]
        at com.extendedclip.papi.expansion.essentials.EssentialsExpansion.onPlaceholderRequest(EssentialsExpansion.java:177) ~[?:?]
        at me.clip.placeholderapi.PlaceholderHook.onRequest(PlaceholderHook.java:38) ~[?:?]
        at me.clip.placeholderapi.PlaceholderAPI.setPlaceholders(PlaceholderAPI.java:237) ~[?:?]
        at me.clip.placeholderapi.PlaceholderAPI.setPlaceholders(PlaceholderAPI.java:205) ~[?:?]
        at me.clip.placeholderapi.commands.PlaceholderAPICommands.onCommand(PlaceholderAPICommands.java:186) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[patched_1.13.2.jar:git-Paper-507]
        ... 15 more