Players can't break blocks or attack entities, i'm using latest version of spigot 1.8. I have these plugins: Essentials-2.x-SNAPSHOT.jar, EssentialsChat-2.x-SNAPSHOT.jar, EssentialsProtect-2.x-SNAPSHOT.jar, and EssentialsSpawn-2.x-SNAPSHOT.jar. I installed them from https://hub.spigotmc.org/jenkins/job/Spigot-Essentials/lastStableBuild/
Here's my server log(Sorry i don't have pastebin):
[16:56:59] [Server thread/INFO]: [Essentials] Enabling Essentials vTeamCity
[16:56:59] [Server thread/INFO]: Bukkit version format changed. Version not checked.
[16:56:59] [Server thread/INFO]: git-Spigot-c3c767f-33d5de3 (MC: 1.8)
[16:56:59] [Server thread/INFO]: 1.8-R0.1-SNAPSHOT
[16:56:59] [Server thread/INFO]: Creating config from template: /Users/rishiraja/Desktop/Minecraft/Server/Spigot 1.8/plugins/Essentials/config.yml
[16:56:59] [Server thread/ERROR]: java.lang.NoSuchMethodError: java.nio.CharBuffer.subSequence(II)Ljava/nio/CharBuffer;
[16:56:59] [Server thread/ERROR]: Error occurred while enabling Essentials vTeamCity (Is it up to date?)
java.lang.NullPointerException
at com.earth2me.essentials.Essentials.onDisable(Essentials.java:348) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:323) ~[spigot.jar:git-Spigot-c3c767f-33d5de3]
at com.earth2me.essentials.Essentials.handleCrash(Essentials.java:747) ~[?:?]
at com.earth2me.essentials.Essentials.onEnable(Essentials.java:275) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot.jar:git-Spigot-c3c767f-33d5de3]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:335) [spigot.jar:git-Spigot-c3c767f-33d5de3]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot.jar:git-Spigot-c3c767f-33d5de3]
at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugin(CraftServer.java:356) [spigot.jar:git-Spigot-c3c767f-33d5de3]
at org.bukkit.craftbukkit.v1_8_R1.CraftServer.enablePlugins(CraftServer.java:316) [spigot.jar:git-Spigot-c3c767f-33d5de3]
at net.minecraft.server.v1_8_R1.MinecraftServer.q(MinecraftServer.java:402) [spigot.jar:git-Spigot-c3c767f-33d5de3]
at net.minecraft.server.v1_8_R1.MinecraftServer.k(MinecraftServer.java:370) [spigot.jar:git-Spigot-c3c767f-33d5de3]
at net.minecraft.server.v1_8_R1.MinecraftServer.a(MinecraftServer.java:325) [spigot.jar:git-Spigot-c3c767f-33d5de3]
at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:211) [spigot.jar:git-Spigot-c3c767f-33d5de3]
at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:505) [spigot.jar:git-Spigot-c3c767f-33d5de3]
at java.lang.Thread.run(Thread.java:695) [?:1.6.0_65]
[16:56:59] [Server thread/INFO]: [EssentialsChat] Enabling EssentialsChat vTeamCity
[16:56:59] [Server thread/INFO]: [EssentialsProtect] Enabling EssentialsProtect vTeamCity
[16:56:59] [Server thread/ERROR]: Essentials not installed or failed to load. Essenials Protect is in emergency mode now.
[16:56:59] [Server thread/INFO]: [EssentialsSpawn] Enabling EssentialsSpawn vTeamCity

I've attached my plugin files.