[17:49:53] [Server thread/INFO]: Starting minecraft server version 1.12
[17:49:53] [Server thread/INFO]: Loading properties
[17:49:53] [Server thread/INFO]: Default game type: SURVIVAL
[17:49:53] [Server thread/INFO]: Generating keypair
[17:49:53] [Server thread/INFO]: Starting Minecraft server on *:25565
[17:49:53] [Server thread/INFO]: Using default channel type
[17:49:54] [Server thread/INFO]: This server is running CraftBukkit version git-Bukkit-9a1fc1e (MC: 1.12) (Implementing API version 1.12-R0.1-SNAPSHOT)
[17:49:54] [Server thread/INFO]: [Skript] Loading Skript v2.2-dev30d
[17:49:54] [Server thread/INFO]: [Essentials] Loading Essentials v2.0.1-b524
[17:49:54] [Server thread/WARN]: **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!
[17:49:54] [Server thread/WARN]: The server will make no attempt to authenticate usernames. Beware.
[17:49:54] [Server thread/WARN]: While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose.
[17:49:54] [Server thread/WARN]: To change this, set "online-mode" to "true" in the server.properties file.
[17:49:54] [Server thread/INFO]: Preparing level "world"
[17:49:55] [Server thread/INFO]: Preparing start region for level 0 (Seed: -7244069259913692521)
[17:49:56] [Server thread/INFO]: Preparing spawn area: 0%
[17:49:57] [Server thread/INFO]: Preparing spawn area: 24%
[17:49:58] [Server thread/INFO]: Preparing spawn area: 53%
[17:49:59] [Server thread/INFO]: Preparing spawn area: 81%
[17:49:59] [Server thread/INFO]: Preparing start region for level 1 (Seed: -7244069259913692521)
[17:50:00] [Server thread/INFO]: Preparing spawn area: 24%
[17:50:01] [Server thread/INFO]: Preparing spawn area: 50%
[17:50:02] [Server thread/INFO]: Preparing spawn area: 76%
[17:50:03] [Server thread/INFO]: Preparing start region for level 2 (Seed: -7244069259913692521)
[17:50:04] [Server thread/INFO]: [Skript] Enabling Skript v2.2-dev30d
[17:50:04] [Server thread/ERROR]: Error occurred while enabling Skript v2.2-dev30d (Is it up to date?)
java.lang.NoSuchMethodError: org.bukkit.Effect.getName()Ljava/lang/String;
	at ch.njol.skript.util.VisualEffect$Type.<init>(VisualEffect.java:196) ~[?:?]
	at ch.njol.skript.util.VisualEffect$Type.<clinit>(VisualEffect.java:63) ~[?:?]
	at ch.njol.skript.util.VisualEffect.<clinit>(VisualEffect.java:255) ~[?:?]
	at ch.njol.skript.classes.data.SkriptClasses.<clinit>(SkriptClasses.java:889) ~[?:?]
	at ch.njol.skript.Skript.onEnable(Skript.java:282) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[craftbukkit.jar:git-Bukkit-9a1fc1e]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:329) [craftbukkit.jar:git-Bukkit-9a1fc1e]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:401) [craftbukkit.jar:git-Bukkit-9a1fc1e]
	at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:360) [craftbukkit.jar:git-Bukkit-9a1fc1e]
	at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:321) [craftbukkit.jar:git-Bukkit-9a1fc1e]
	at net.minecraft.server.v1_12_R1.MinecraftServer.t(MinecraftServer.java:411) [craftbukkit.jar:git-Bukkit-9a1fc1e]
	at net.minecraft.server.v1_12_R1.MinecraftServer.l(MinecraftServer.java:372) [craftbukkit.jar:git-Bukkit-9a1fc1e]
	at net.minecraft.server.v1_12_R1.MinecraftServer.a(MinecraftServer.java:327) [craftbukkit.jar:git-Bukkit-9a1fc1e]
	at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:248) [craftbukkit.jar:git-Bukkit-9a1fc1e]
	at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:521) [craftbukkit.jar:git-Bukkit-9a1fc1e]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_131]
[17:50:04] [Server thread/INFO]: [Essentials] Enabling Essentials v2.0.1-b524
[17:50:04] [Server thread/INFO]: [Essentials] Using 1.8.3+ BlockStateMeta provider as mob spawner provider.
[17:50:05] [Server thread/INFO]: [Essentials] Using Reflection based provider as spawn egg provider.
[17:50:05] [Server thread/INFO]: [Essentials] Using 1.9+ BasePotionData provider as potion meta provider.
[17:50:05] [Server thread/INFO]: Using locale pl_PL
[17:50:05] [Server thread/INFO]: [Essentials] Using Spigot 1.7.10+ ServerListPingEvent iterator
[17:50:05] [Server thread/INFO]: [Essentials] Starting Metrics. Opt-out using the global bStats config.
[17:50:05] [Server thread/INFO]: [Essentials] Using superperms-based permissions.
[17:50:05] [Server thread/INFO]: Server permissions file permissions.yml is empty, ignoring it
[17:50:05] [Server thread/INFO]: Done (11,515s)! For help, type "help" or "?"
[17:50:11] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 3404ms behind, skipping 68 tick(s)
[17:53:26] [Server thread/INFO]: [Skript] Reloading test.sk...
[17:53:26] [Server thread/ERROR]: Can't understand this condition/effect: send "lol" (test.sk, line 3: send "lol"')
[17:53:26] [Server thread/INFO]: [Skript] Encountered 1 error while reloading test.sk!