hy...
when i upload an image 64x64 with the name Server-Icon i get an error:

Couldn't load server icon
java.lang.IllegalArgumentException: Must be 64 pixels wide
at org.apache.commons.lang.Validate.isTrue(Validate.java:136) ~[patched_1.15.2.jar:git-Paper-379]
at org.bukkit.craftbukkit.v1_15_R1.CraftServer.loadServerIcon0(CraftServer.java:1877) ~[patched_1.15.2.jar:git-Paper-379]
at org.bukkit.craftbukkit.v1_15_R1.CraftServer.loadServerIcon0(CraftServer.java:1865) ~[patched_1.15.2.jar:git-Paper-379]
at org.bukkit.craftbukkit.v1_15_R1.CraftServer.loadIcon(CraftServer.java:937) ~[patched_1.15.2.jar:git-Paper-379]
at org.bukkit.craftbukkit.v1_15_R1.CraftServer.(CraftServer.java:323) ~[patched_1.15.2.jar:git-Paper-379]
at net.minecraft.server.v1_15_R1.PlayerList.(PlayerList.java:80) ~[patched_1.15.2.jar:git-Paper-379]
at net.minecraft.server.v1_15_R1.DedicatedPlayerList.(SourceFile:14) ~[patched_1.15.2.jar:git-Paper-379]
at net.minecraft.server.v1_15_R1.DedicatedServer.init(DedicatedServer.java:183) ~[patched_1.15.2.jar:git-Paper-379]
at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:908) ~[patched_1.15.2.jar:git-Paper-379]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_262]

can anyone say why its doing that?

This is not related even in the slightest to luckperms

What is the problem??

This is not the right place for this issue.

I mean you’re also not asking your dentist for help with a broken leg, are you?

But were i must to ask it

there is no one that will help me

Well if you keep asking in the wrong places this is to be expected.

I’d recommend asking on the SpigotMC forum.

how i can make a forum on spigot?

Ask in spigot discord: https://discord.gg/spigotmc
Or their forum: https://www.spigotmc.org/forums/

This is not a luckperms issue at all, so please, go to the right place to ask. You will not get any solutions here.

You’re not supposed to make a forum on Spigot. You’re supposed to ask on the SpigotMC forum.

https://lmgtfy.com/?q=spigotmc+forum