[Error] "Is it up to date?" Error while loading my custom plugin.

Hello everyone.

I'm having a problem loading a plugin.
I developed it with Maven and IntelliJ IDEA for Spigot.

While loading it gives me the following error:

Code:

[13:57:15 ERROR]: Error occurred while enabling CrystalHub v1.0 (Is it up to date?)
java.lang.NullPointerException: Cannot invoke "org.bukkit.command.PluginCommand.setExecutor(org.bukkit.command.CommandExecutor)" because the return value of "me.skmanux.crystalhub.CrystalHub.getCommand(String)" is null
        at me.skmanux.crystalhub.CrystalHub.setupCmds(CrystalHub.java:59) ~[CrystalHub-1.0.jar:?]
        at me.skmanux.crystalhub.CrystalHub.onEnable(CrystalHub.java:113) ~[CrystalHub-1.0.jar:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:370) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:501) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:?]
        at com.rylinaux.plugman.util.PluginUtil.load(PluginUtil.java:309) ~[PlugMan.jar:?]
        at com.rylinaux.plugman.command.LoadCommand.execute(LoadCommand.java:114) ~[PlugMan.jar:?]
        at com.rylinaux.plugman.PlugManCommandHandler.onCommand(PlugManCommandHandler.java:95) ~[PlugMan.jar:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.v1_18_R2.CraftServer.dispatchCommand(CraftServer.java:905) ~[paper-1.18.2.jar:git-Paper-276]
        at org.bukkit.craftbukkit.v1_18_R2.CraftServer.dispatchServerCommand(CraftServer.java:868) ~[paper-1.18.2.jar:git-Paper-276]
        at net.minecraft.server.dedicated.DedicatedServer.handleConsoleInputs(DedicatedServer.java:510) ~[paper-1.18.2.jar:git-Paper-276]
        at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:484) ~[paper-1.18.2.jar:git-Paper-276]
        at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1455) ~[paper-1.18.2.jar:git-Paper-276]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1225) ~[paper-1.18.2.jar:git-Paper-276]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:315) ~[paper-1.18.2.jar:git-Paper-276]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]
[13:57:15 INFO]: [[CrystalHub]] Disabling CrystalHub v1.0

Can anyone help me?

 

Thank you. I didn't notice that.