Problem with DeluxeHub plugin.

Everytime i edit the serverselector.yml on the menus folder i get this error in console and the plugin shut down. Please help .

Code:

Error occurred while enabling DeluxeHub v3.5.4 (Is it up to date?)
java.lang.NullPointerException: Cannot invoke "java.lang.CharSequence.length()" because "this.text" is null
    at java.util.regex.Matcher.getTextLength(Matcher.java:1769) ~[?:?]
    at java.util.regex.Matcher.reset(Matcher.java:415) ~[?:?]
    at java.util.regex.Matcher.<init>(Matcher.java:252) ~[?:?]
    at java.util.regex.Pattern.matcher(Pattern.java:1134) ~[?:?]
    at fun.lewisdev.deluxehub.utility.color.patterns.GradientPattern.process(GradientPattern.java:23) ~[DeluxeHub-3.5.4 (1).jar:?]
    at fun.lewisdev.deluxehub.utility.color.IridiumColorAPI.process(IridiumColorAPI.java:67) ~[DeluxeHub-3.5.4 (1).jar:?]
    at fun.lewisdev.deluxehub.utility.TextUtil.color(TextUtil.java:16) ~[DeluxeHub-3.5.4 (1).jar:?]
    at fun.lewisdev.deluxehub.inventory.inventories.CustomGUI.onEnable(CustomGUI.java:25) ~[DeluxeHub-3.5.4 (1).jar:?]
    at java.util.HashMap$Values.forEach(HashMap.java:1065) ~[?:?]
    at fun.lewisdev.deluxehub.inventory.InventoryManager.onEnable(InventoryManager.java:29) ~[DeluxeHub-3.5.4 (1).jar:?]
    at fun.lewisdev.deluxehub.DeluxeHubPlugin.onEnable(DeluxeHubPlugin.java:91) ~[DeluxeHub-3.5.4 (1).jar:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:281) ~[paper-api-1.20.1-R0.1-SNAPSHOT.jar:?]
    at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:189) ~[paper-1.20.1.jar:git-Paper-169]
    at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:104) ~[paper-1.20.1.jar:git-Paper-169]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:507) ~[paper-api-1.20.1-R0.1-SNAPSHOT.jar:?]
    at org.bukkit.craftbukkit.v1_20_R1.CraftServer.enablePlugin(CraftServer.java:640) ~[paper-1.20.1.jar:git-Paper-169]
    at org.bukkit.craftbukkit.v1_20_R1.CraftServer.enablePlugins(CraftServer.java:551) ~[paper-1.20.1.jar:git-Paper-169]
    at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:635) ~[paper-1.20.1.jar:git-Paper-169]
    at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:434) ~[paper-1.20.1.jar:git-Paper-169]
    at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:308) ~[paper-1.20.1.jar:git-Paper-169]
    at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1100) ~[paper-1.20.1.jar:git-Paper-169]
    at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:317) ~[paper-1.20.1.jar:git-Paper-169]
    at java.lang.Thread.run(Thread.java:833) ~[?:?]

serverselector.yml

Code:

# Server Selector GUI
# The ID of this inventory is 'serverselector' which you can open using the [MENU] action (e.g. "[MENU] serverselector").
# You can create more custom GUIs, just copy this entire file and paste a new one in the menus directory. The name of the file is the menu ID.
#
# PLAYER HEADS
#   You can have player heads, using player names, base64 or HeadDatabase IDs.
#   Examples
#     Username (must have logged into the server once)
#       material: PLAYER_HEAD
#       username: <name>
#
#     Base64
#       material: PLAYER_HEAD
#       base64: <base64 id>
#
#     HeadDatabase
#       material: PLAYER_HEAD
#       hdb: <hdb id>
#
# ITEM FLAGS
#   You can add flags to the item (https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/inventory/ItemFlag.html)
#   Example:
#     item_flags:
#       - HIDE_ATTRIBUTES
#       - HIDE_DESTROYS
#       - HIDE_ENCHANTS
#       - HIDE_PLACED_ON
#       - HIDE_POTION_EFFECTS
#       - HIDE_UNBREAKABLE
#
# ITEM ACTIONS
#   All item actions can be found here https://wiki.lewisdev.fun/free-resources/deluxehub/action-types

# Slots of the GUI
slots: 27

# Title of the GUI
title: "&4&lSeleziona Modalità di gioco"

# Automatically update open inventories.
# This can be used to update placeholders in the GUI.
refresh:
  enabled: false
  rate: 40

# The items inside the GUI can be listed here
items:
  filler:
    material: RED_STAINED_GLASS_PANE
    slot: -1 # Setting the slot to -1 will fill every empty slot, you can also do "slots: [0, 1, 2]"
  factions:
    material: GRASS_BLOCK
    slot: 11
    amount: 1
    glow: false
    display_name: '&a&lVanilla Jacckonica
    lore:
      - '&a[&4&lJacckonia&0]'
      - 'Clicca per entrare nella modalità.'
    actions:
      - '[CLOSE]'
      - '[MESSAGE] &7Caricamento in corso.. (&a&lVanilla Jacckonica&r)'
      - '[CONSOLE] mvtp %player% WorldVanilla'
      # For multi-world servers using Multiverse-Core, use the action:
      # - '[CONSOLE] mvtp %player% world'
  survival:
    material: GRASS_BLOCK
    slot: 15
    amount: 1
    glow: false
    display_name: '&aSurvival'
    lore:
      - '&7Join now!'
      - '&aMulti lore support too!'
    actions:
      - '[CLOSE]'
      - '[MESSAGE] &7Sending you to: &eSurvival'
      - '[BUNGEE] survival'