[15:43:40] [Server thread/WARN]: [ArenaPvP] Task #54 for ArenaPvP v4.6 generated an exception
java.lang.NoSuchMethodError: org.bukkit.scoreboard.Score.isScoreSet()Z
at ro.Marius.ArenaPvP.ScoreboardManager.ScoreboardAPI.a(ScoreboardAPI.java:148) ~[?:?]
at ro.Marius.ArenaPvP.ScoreboardManager.ScoreboardAPI.a(ScoreboardAPI.java:123) ~[?:?]
at ro.Marius.ArenaPvP.ScoreboardManager.ScoreboardAPI.a(ScoreboardAPI.java:113) ~[?:?]
at ro.Marius.ArenaPvP.ScoreboardManager.ScoreboardManager$2.run(ScoreboardManager.java:94) ~[?:?]
at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java:53) ~[craftbukkit.jar:git-Bukkit-3fc97ff]
at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:349) [craftbukkit.jar:git-Bukkit-3fc97ff]
at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:668) [craftbukkit.jar:git-Bukkit-3fc97ff]
at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:284) [craftbukkit.jar:git-Bukkit-3fc97ff]
at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:609) [craftbukkit.jar:git-Bukkit-3fc97ff]
at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:517) [craftbukkit.jar:git-Bukkit-3fc97ff]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_91]