Hello si i'm using luckperms on bungee and when I try to install the placeholder with placeholderAPI i get this error :

org.bukkit.command.CommandException: Unhandled exception executing command 'papi' in plugin PlaceholderAPI v2.10.4
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[patched_1.12.2.jar:git-Paper-1618]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:152) ~[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$0(PlayerConnectionUtils.java:14) ~[patched_1.12.2.jar:git-Paper-1618]
at java.util.concurrent.Executors$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:748) [?:1.8.0_212]
Caused by: java.lang.NoClassDefFoundError: net/luckperms/api/LuckPerms
at me.lucko.luckperms.placeholders.LuckPermsExpansion.canRegister(LuckPermsExpansion.java:48) ~[?:?]
at me.clip.placeholderapi.expansion.ExpansionManager.registerExpansion(ExpansionManager.java:102) ~[?:?]
at me.clip.placeholderapi.expansion.ExpansionManager.registerAllExpansions(ExpansionManager.java:154) ~[?:?]
at me.clip.placeholderapi.PlaceholderAPIPlugin.reloadConf(PlaceholderAPIPlugin.java:176) ~[?:?]
at me.clip.placeholderapi.commands.PlaceholderAPICommands.onCommand(PlaceholderAPICommands.java:226) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[patched_1.12.2.jar:git-Paper-1618]
... 15 more

https://github.com/lucko/LuckPerms/wiki/Upgrading-from-v4-to-v5#api-compatibility

Same problem, and when I try to use
https://ci.lucko.me/job/extension-legacy-api/lastSuccessfulBuild/artifact/build/libs/extension-legacy-api-1.0.0.jar I have no error but %the placeholders doesn't works

I used another version of Luckperms-Extension from another server and it works :)