So I hosted a spigot1.12.2 server and added those plugins:LuckPerms, SkinsRestorer, OpeNLogin, Scoreboard-revision, Vault, Essentials, EssentialsSpawn, EssentialsChat.

Every time a start my server, it will show up this problem.

[22:15:27 INFO]: Mob Spawn Range: 4
[22:15:27 INFO]: Hopper Transfer: 8 Hopper Check: 1 Hopper Amount: 1
[22:15:27 INFO]: Random Lighting Updates: false
[22:15:27 INFO]: Structure Info Saving: true
[22:15:27 INFO]: Custom Map Seeds:  Village: 10387312 Feature: 14357617 Monument: 10387313 Slime: 987234911
[22:15:27 INFO]: Max TNT Explosions: 100
[22:15:27 INFO]: Tile Max Tick Time: 50ms Entity max Tick Time: 50ms
[22:15:27 INFO]: Item Merge Radius: 2.5
[22:15:27 INFO]: Item Despawn Rate: 6000
[22:15:27 INFO]: Arrow Despawn Rate: 1200
[22:15:27 INFO]: Allow Zombie Pigmen to spawn from portal blocks: true
[22:15:27 INFO]: View Distance: 10
[22:15:27 INFO]: Experience Merge Radius: 3.0
[22:15:27 INFO]: Zombie Aggressive Towards Villager: true
[22:15:27 INFO]: Nerfing mobs spawned from spawners: false
[22:15:27 INFO]: Preparing start region for level 0 (Seed: -8988771669370255766)
[22:15:28 INFO]: Preparing spawn area: 20%
[22:15:29 INFO]: Preparing start region for level 1 (Seed: -8988771669370255766)
[22:15:30 INFO]: Preparing start region for level 2 (Seed: -8988771669370255766)
[22:15:30 INFO]: [SkinsRestorer] Enabling SkinsRestorer v13.8.8
[22:15:30 INFO]: [SkinsRestorer] Failed PaperSkinRefresher
[22:15:30 INFO]: [SkinsRestorer] Using SpigotSkinRefresher
[22:15:30 INFO]: [SkinsRestorer] Detected Minecraft v1_12_R1, using UniversalSkinFactory.
[22:15:36 INFO]: [OpeNLogin] Enabling OpeNLogin v1.2
[22:15:36 INFO]: [OpeNLogin]    __                                
[22:15:36 INFO]: [OpeNLogin]   /___    _  /\ \ \/ /  _    () __
[22:15:36 INFO]: [OpeNLogin]  //  // ' \ /  \/  \/ / /  /  \ / ` | | '_ \
[22:15:36 INFO]: [OpeNLogin] / _//| |) |  / /\  / /| () | (_| | | | | |
[22:15:36 INFO]: [OpeNLogin] __/ | ./ __\ \/__/_/ _, ||| |_|
[22:15:36 INFO]: [OpeNLogin]       ||                          |__/         
[22:15:36 INFO]: [OpeNLogin] By: www.nickuc.com / github.com/nickuc/OpeNLogin - V 1.2
[22:15:36 INFO]: [OpeNLogin] 
[22:15:37 INFO]: [Scoreboard-revision] Enabling Scoreboard-revision vR3 1.4.2 RELEASE
[22:15:38 WARN]: java.io.IOException: Server returned HTTP response code: 403 for URL: https://www.spigotmc.org/api/general.php
[22:15:38 WARN]:  at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1900)
[22:15:38 WARN]:  at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498)
[22:15:38 WARN]:  at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:268)
[22:15:38 WARN]:  at rien.bijl.Scoreboard.r.Session.isUpToDate(Session.java:45)
[22:15:38 WARN]:  at rien.bijl.Scoreboard.r.Main.init(Main.java:33)
[22:15:38 WARN]:  at rien.bijl.Scoreboard.r.Main.onEnable(Main.java:24)
[22:15:38 WARN]:  at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264)
[22:15:38 WARN]:  at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337)
[22:15:38 WARN]:  at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:403)
[22:15:38 WARN]:  at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:381)
[22:15:38 WARN]:  at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:330)
[22:15:38 WARN]:  at net.minecraft.server.v1_12_R1.MinecraftServer.t(MinecraftServer.java:422)
[22:15:38 WARN]:  at net.minecraft.server.v1_12_R1.MinecraftServer.l(MinecraftServer.java:383)
[22:15:38 WARN]:  at net.minecraft.server.v1_12_R1.MinecraftServer.a(MinecraftServer.java:338)
[22:15:38 WARN]:  at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:272)
[22:15:38 WARN]:  at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:545)
[22:15:38 WARN]:  at java.lang.Thread.run(Thread.java:748)
[22:15:38 INFO]: [Scoreboard-revision] Loaded app handler for board: board
[22:15:38 INFO]: Scoreboard is online! Scoreboard version: R3 1.4.2 RELEASE (OUTDATED)
[22:15:38 INFO]: [Essentials] Enabling Essentials v2.18.2.0
[22:15:38 INFO]: [Essentials] You are running a server with limited API functionality. EssentialsX will still work, but certain features may be disabled.
[22:15:38 INFO]: Attempting to convert old kits in config.yml to new kits.yml
[22:15:38 INFO]: No kits found to migrate.
[22:15:38 INFO]: [Essentials] Starting Essentials ban format conversion
[22:15:38 INFO]: [Essentials] Starting usermap repair
[22:15:38 WARN]: [Essentials] Missing userdata folder, aborting
[22:15:38 INFO]: Attempting to migrate ignore list to UUIDs
[22:15:38 INFO]: Loaded 852 items from items.csv.
[22:15:38 INFO]: Using locale en_US
[22:15:38 INFO]: [Essentials] ServerListPingEvent: Spigot iterator API
[22:15:38 INFO]: [Essentials] Starting Metrics. Opt-out using the global bStats config.
[22:15:38 INFO]: [Vault] [Economy] Essentials Economy hooked.
[22:15:38 INFO]: [Essentials] Using Vault based permissions (LuckPerms)
[22:15:38 INFO]: [EssentialsSpawn] Enabling EssentialsSpawn v2.18.2.0
[22:15:38 INFO]: [EssentialsSpawn] Starting Metrics. Opt-out using the global bStats config.
[22:15:38 INFO]: [EssentialsChat] Enabling EssentialsChat v2.18.2.0
[22:15:38 INFO]: [EssentialsChat] Starting Metrics. Opt-out using the global bStats config.
[22:15:38 INFO]: Server permissions file permissions.yml is empty, ignoring it
[22:15:38 INFO]: Done (11.670s)! For help, type "help" or "?"