Please Help me to console (server is crashing)

oading libraries, please wait... [10:01:59 INFO]: Starting minecraft server version 1.8 [10:01:59 WARN]: To start the server with more ram, launch it as "java -Xmx1024M -Xms1024M -jar minecraft_server.jar" [10:01:59 INFO]: Loading properties [10:01:59 INFO]: Default game type: SURVIVAL [10:01:59 INFO]: Generating keypair [10:02:00 INFO]: Starting Minecraft server on *:41226 [10:02:01 INFO]: This server is running CraftBukkit version git-Bukkit-7019900 (MC: 1.8) (Implementing API version 1.8-R0.1-SNAPSHOT) [10:02:02 INFO]: [ClearLag] Loading ClearLag v2.9.7 [10:02:02 INFO]: [PermissionsEx] Loading PermissionsEx v1.23.4 [10:02:02 WARN]: [PermissionsEx] This server is in offline mode. Unless this server is configured to integrate with a supported proxy (see http://dft.ba/-8ous), UUIDs *may not be stable*! [10:02:02 INFO]: [WorldEdit] Loading WorldEdit v6.1.8-SNAPSHOT;cd4729f [10:02:02 INFO]: [Essentials] Loading Essentials vTeamCity [10:02:02 INFO]: [EssentialsSpawn] Loading EssentialsSpawn vTeamCity [10:02:02 INFO]: [EssentialsChat] Loading EssentialsChat vTeamCity [10:02:02 INFO]: [EssentialsGeoIP] Loading EssentialsGeoIP vTeamCity [10:02:02 INFO]: [WorldGuard] Loading WorldGuard v6.2.1;84bc322 [10:02:02 INFO]: [EssentialsAntiBuild] Loading EssentialsAntiBuild vTeamCity [10:02:02 INFO]: [EssentialsProtect] Loading EssentialsProtect vTeamCity [10:02:03 WARN]: **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE! [10:02:03 WARN]: The server will make no attempt to authenticate usernames. Beware. [10:02:03 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. [10:02:03 WARN]: To change this, set "online-mode" to "true" in the server.properties file. [10:02:03 INFO]: Preparing level "world" [10:02:03 INFO]: Preparing start region for level 0 (Seed: 5274496281729973268) [10:02:05 INFO]: Preparing spawn area: 10% [10:02:06 INFO]: Preparing spawn area: 15% [10:02:07 INFO]: Preparing spawn area: 26% [10:02:08 INFO]: Preparing spawn area: 35% [10:02:09 INFO]: Preparing spawn area: 41% [10:02:10 INFO]: Preparing spawn area: 45% [10:02:11 INFO]: Preparing spawn area: 53% [10:02:11 INFO]: Preparing start region for level 1 (Seed: -4411693485999559140) [10:02:12 INFO]: Preparing spawn area: 7% [10:02:13 INFO]: Preparing spawn area: 38% [10:02:15 INFO]: Preparing spawn area: 88% [10:02:15 INFO]: Preparing start region for level 2 (Seed: -4411693485999559140) [10:02:15 INFO]: [ClearLag] Enabling ClearLag v2.9.7 [10:02:16 INFO]: [ClearLag] Loading modules... [10:02:16 INFO]: [ClearLag] Modules enabed, loading config values [10:02:16 INFO]: [ClearLag] Modules have been loaded! [10:02:16 INFO]: [ClearLag] Clearlag is now enabled! [10:02:16 INFO]: [ClearLag] Checking for updates compatible with your bukkit version [1.8]... [10:02:16 INFO]: [PermissionsEx] Enabling PermissionsEx v1.23.4 [10:02:16 INFO]: [PermissionsEx] Initializing file backend [10:02:16 INFO]: [PermissionsEx] Permissions file successfully reloaded [10:02:17 INFO]: [WorldEdit] Enabling WorldEdit v6.1.8-SNAPSHOT;cd4729f [10:02:24 INFO]: WEPIF: PermissionsEx detected! Using PermissionsEx for permissions. [10:02:24 INFO]: [WorldEdit] Using com.sk89q.worldedit.bukkit.adapter.impl.Spigot_v1_8_R1 as the Bukkit adapter [10:02:24 INFO]: [Essentials] Enabling Essentials vTeamCity [10:02:25 INFO]: Bukkit version format changed. Version not checked. [10:02:25 INFO]: git-Bukkit-7019900 (MC: 1.8) [10:02:25 INFO]: 1.8-R0.1-SNAPSHOT [10:02:25 INFO]: [ClearLag] No updates found! [10:02:25 INFO]: Using locale en_US [10:02:26 INFO]: Using locale en_US [10:02:27 INFO]: Essentials: Using PermissionsEx based permissions. [10:02:27 INFO]: [EssentialsSpawn] Enabling EssentialsSpawn vTeamCity [10:02:27 INFO]: [EssentialsChat] Enabling EssentialsChat vTeamCity [10:02:27 INFO]: [EssentialsGeoIP] Enabling EssentialsGeoIP vTeamCity [10:02:27 INFO]: [EssentialsGeoIP] This product includes GeoLite data created by MaxMind, available from http://www.maxmind.com/. [10:02:27 INFO]: [WorldGuard] Enabling WorldGuard v6.2.1;84bc322 [10:02:28 INFO]: [WorldGuard] (world) TNT ignition is PERMITTED. [10:02:28 INFO]: [WorldGuard] (world) Lighters are PERMITTED. [10:02:28 INFO]: [WorldGuard] (world) Lava fire is blocked. [10:02:28 INFO]: [WorldGuard] (world) Fire spread is UNRESTRICTED. [10:02:28 INFO]: [WorldGuard] Loaded configuration for world 'world' [10:02:28 INFO]: [WorldGuard] (world_nether) TNT ignition is PERMITTED. [10:02:28 INFO]: [WorldGuard] (world_nether) Lighters are PERMITTED. [10:02:28 INFO]: [WorldGuard] (world_nether) Lava fire is blocked. [10:02:28 INFO]: [WorldGuard] (world_nether) Fire spread is UNRESTRICTED. [10:02:28 INFO]: [WorldGuard] Loaded configuration for world 'world_nether' [10:02:28 INFO]: [WorldGuard] (world_the_end) TNT ignition is PERMITTED. [10:02:28 INFO]: [WorldGuard] (world_the_end) Lighters are PERMITTED. [10:02:28 INFO]: [WorldGuard] (world_the_end) Lava fire is blocked. [10:02:28 INFO]: [WorldGuard] (world_the_end) Fire spread is UNRESTRICTED. [10:02:28 INFO]: [WorldGuard] Loaded configuration for world 'world_the_end' [10:02:28 INFO]: [WorldGuard] Loading region data... [10:02:29 INFO]: [EssentialsAntiBuild] Enabling EssentialsAntiBuild vTeamCity [10:02:29 INFO]: [EssentialsProtect] Enabling EssentialsProtect vTeamCity [10:02:29 INFO]: Server permissions file permissions.yml is empty, ignoring it [10:02:30 INFO]: Done (27.693s)! For help, type "help" or "?" [10:02:30 INFO]: Starting GS4 status listener [10:02:30 INFO]: Query running on 0.0.0.0:41226 [10:02:37 WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 6810ms behind, skipping 136 tick(s) groups [10:02:40 INFO]: Unknown command. Type "help" for help. group [10:02:56 INFO]: Unknown command. Type "help" for help. /gropup [10:03:07 INFO]: Unknown command. Type "help" for help. /groups [10:03:14 INFO]: Unknown command. Type "help" for help. //groups [10:03:21 INFO]: Unknown command. Type "help" for help. [10:03:32 INFO]: MR_Lalkaer[/78.106.241.116:58083] logged in with entity id 44034 at ([world] -10.43073439299432, 78.73152737739683, 63.68965383647179) [10:04:19 FATAL]: A single server tick took 60.00 seconds (should be max 0.05) [10:04:19 FATAL]: Considering it to be crashed, server will forcibly shutdown. [10:04:19 ERROR]: This crash report has been saved to: /home/gs/gs/data/servers/10183007/./crash-reports/crash-2