Im trying to use plugins but they dont work when I start the server

This is what pops up:
[17:34:04 INFO]: Starting minecraft server version 1.12
[17:34:04 INFO]: Loading properties
[17:34:04 WARN]: You specified a resource pack without providing a sha1 hash. Pack will be updated on the client only if you change the name of the pack.
[17:34:04 INFO]: Default game type: CREATIVE
[17:34:04 INFO]: Generating keypair
[17:34:04 INFO]: Starting Minecraft server on *:25565
[17:34:04 INFO]: Using default channel type
[17:34:05 INFO]: This server is running CraftBukkit version git-Bukkit-9a1fc1e (MC: 1.12) (Implementing API version 1.12-R0.1-SNAPSHOT)
[17:34:06 INFO]: [WorldEdit] Loading WorldEdit v6.1.7;dd00bb1
[17:34:06 INFO]: [Essentials] Loading Essentials v2.13.1
[17:34:06 INFO]: [EssentialsProtect] Loading EssentialsProtect v2.13.1
[17:34:06 INFO]: [EssentialsSpawn] Loading EssentialsSpawn v2.13.1
[17:34:06 INFO]: [EssentialsChat] Loading EssentialsChat v2.13.1
[17:34:06 INFO]: [GroupManager] Loading GroupManager vPre2.14.1.3 FINAL (Phoenix)
[17:34:06 INFO]: [EssentialsAntiBuild] Loading EssentialsAntiBuild v2.13.1
[17:34:06 INFO]: Preparing level "world"
[17:34:08 INFO]: Preparing start region for level 0 (Seed: -7156122593300540254)
[17:34:09 INFO]: Preparing spawn area: 2%
[17:34:10 INFO]: Preparing spawn area: 34%
[17:34:11 INFO]: Preparing spawn area: 51%
[17:34:12 INFO]: Preparing spawn area: 81%
[17:34:12 INFO]: Preparing start region for level 1 (Seed: -7156122593300540254)
[17:34:13 INFO]: Preparing spawn area: 27%
[17:34:14 INFO]: Preparing spawn area: 54%
[17:34:15 INFO]: Preparing spawn area: 91%
[17:34:16 INFO]: Preparing start region for level 2 (Seed: -7156122593300540254)
[17:34:17 INFO]: Preparing spawn area: 54%
[17:34:17 INFO]: [WorldEdit] Enabling WorldEdit v6.1.7;dd00bb1
[17:34:17 INFO]: WEPIF: Using the Bukkit Permissions API.
[17:34:17 INFO]: [WorldEdit] Using com.sk89q.worldedit.bukkit.adapter.impl.Spigot_v1_12_R1 as the Bukkit adapter
[17:34:17 INFO]: [Essentials] Enabling Essentials v2.13.1
[17:34:17 INFO]: Bukkit version format changed. Version not checked.
[17:34:17 INFO]: git-Bukkit-9a1fc1e (MC: 1.12)
[17:34:17 INFO]: 1.12-R0.1-SNAPSHOT
[17:34:18 ERROR]: java.lang.NoSuchMethodError: com.google.common.cache.CacheBuilder.maximumSize(I)Lcom/google/common/cache/CacheBuilder;
[17:34:18 ERROR]: Error occurred while enabling Essentials v2.13.1 (Is it up to date?)
java.lang.NoSuchMethodError: org.bukkit.Server.getOnlinePlayers()[Lorg/bukkit/entity/Player;
at com.earth2me.essentials.Essentials.handleCrash(Essentials.java:698) ~[?:?]
at com.earth2me.essentials.Essentials.onEnable(Essentials.java:256) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:329) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:401) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:360) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:321) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.t(MinecraftServer.java:411) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.l(MinecraftServer.java:372) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.a(MinecraftServer.java:327) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:248) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:521) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]
[17:34:18 INFO]: [EssentialsProtect] Enabling EssentialsProtect v2.13.1
[17:34:18 INFO]: [EssentialsSpawn] Enabling EssentialsSpawn v2.13.1
[17:34:18 INFO]: [EssentialsChat] Enabling EssentialsChat v2.13.1
[17:34:18 INFO]: [GroupManager] Enabling GroupManager vPre2.14.1.3 FINAL (Phoenix)
[17:34:18 INFO]: GroupManager - INFO - World Found: world
[17:34:18 ERROR]: Error occurred while enabling GroupManager vPre2.14.1.3 FINAL (Phoenix) (Is it up to date?)
java.lang.NoSuchMethodError: org.bukkit.Server.getOnlinePlayers()[Lorg/bukkit/entity/Player;
at org.anjocaido.groupmanager.permissions.BukkitPermissions.updateAllPlayers(BukkitPermissions.java:383) ~[?:?]
at org.anjocaido.groupmanager.permissions.BukkitPermissions.reset(BukkitPermissions.java:110) ~[?:?]
at org.anjocaido.groupmanager.permissions.BukkitPermissions.<init>(BukkitPermissions.java:96) ~[?:?]
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:209) ~[?:?]
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:103) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:329) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:401) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:360) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:321) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.t(MinecraftServer.java:411) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.l(MinecraftServer.java:372) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.a(MinecraftServer.java:327) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:248) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:521) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]
[17:34:18 INFO]: WEPIF: Using the Bukkit Permissions API.
[17:34:18 INFO]: [EssentialsAntiBuild] Enabling EssentialsAntiBuild v2.13.1
[17:34:18 ERROR]: º4Unknown item 10 in protect.alert.on-placement list.
[17:34:18 ERROR]: º4Unknown item 11 in protect.alert.on-placement list.
[17:34:18 ERROR]: º4Unknown item 46 in protect.alert.on-placement list.
[17:34:18 ERROR]: º4Unknown item 327 in protect.alert.on-placement list.
[17:34:18 ERROR]: º4Unknown item 327 in protect.alert.on-use list.
[17:34:18 ERROR]: º4Unknown item 10 in protect.blacklist.placement list.
[17:34:18 ERROR]: º4Unknown item 11 in protect.blacklist.placement list.
[17:34:18 ERROR]: º4Unknown item 46 in protect.blacklist.placement list.
[17:34:18 ERROR]: º4Unknown item 327 in protect.blacklist.placement list.
[17:34:18 ERROR]: º4Unknown item 327 in protect.blacklist.usage list.
[17:34:18 INFO]: Server permissions file permissions.yml is empty, ignoring it
[17:34:18 INFO]: Done (11.277s)! For help, type "help" or "?"
[17:34:18 WARN]: [GroupManager] Plugin GroupManager vPre2.14.1.3 FINAL (Phoenix) generated an exception while executing task 3
java.lang.NoSuchMethodError: org.bukkit.Server.getOnlinePlayers()[Lorg/bukkit/entity/Player;
at org.anjocaido.groupmanager.metrics.Metrics.postPlugin(Metrics.java:335) ~[?:?]
at org.anjocaido.groupmanager.metrics.Metrics.access$400(Metrics.java:57) ~[?:?]
at org.anjocaido.groupmanager.metrics.Metrics$1.run(Metrics.java:223) ~[?:?]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:53) ~[craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52) [craftbukkit-1.12.jar:git-Bukkit-9a1fc1e]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_181]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_181]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]

 

@KingOmegahh

1. Essentials is out of date (it was last updated for 1.8). Instead, for newer servers, use EssentialsX.
2. GroupManager is also out of date. If you need a plugin for handling permissions, use PEX.