Bukkit PlotSquared bug

00:30:47 CONSOLE : /p condense Crea info 15
00:30:47 [P2] === DEFAULT EVAL ===
00:30:47 [P2] MINIMUM RADIUS: 15
00:30:47 [P2] MAXIMUM MOVES: 200
00:30:47 [P2] === INPUT EVAL ===
00:30:47 [P2] INPUT RADIUS: 15
00:30:47 [P2] ESTIMATED MOVES: 200
00:30:47 [P2] ESTIMATED TIME: No idea, times will drastically change based on the system performance and load
00:30:47 [P2] - Radius is measured in plot width
00:30:57 CONSOLE : /p condense Crea start 15
00:30:57 [P2] TASK STARTED...
00:32:46 [P2] Moving: Crea;10;-11 -> Crea;10;-11
00:33:33 marcbal : /speed 10
00:34:07 [P2] Moving: Crea;12;-2 -> Crea;12;-2
00:34:26 marcbal : /p tp 2;-12
00:34:35 marcbal : /p tp 2;-12
00:34:39 marcbal : /p tp 12;-2
00:34:52 [P2] Moving: Crea;10;7 -> Crea;10;7
00:35:38 [P2] Moving: Crea;12;12 -> Crea;12;12
00:35:46 [PlotSquared] Task #233047 for PlotSquared v3.4.5 generated an exception
java.lang.NoSuchMethodError: org.bukkit.entity.Entity.hasGravity()Z
at com.plotsquared.bukkit.object.entity.EntityWrapper.<init>(EntityWrapper.java:90) ~[?:?]
at com.plotsquared.bukkit.util.BukkitChunkManager$ContentMap.saveEntitiesIn(BukkitChunkManager.java:704) ~[?:?]
at com.plotsquared.bukkit.util.BukkitChunkManager$ContentMap.saveEntitiesIn(BukkitChunkManager.java:674) ~[?:?]
at com.plotsquared.bukkit.util.BukkitChunkManager$1.run(BukkitChunkManager.java:166) ~[?:?]
at com.plotsquared.bukkit.util.BukkitChunkManager$1.run(BukkitChunkManager.java:155) ~[?:?]
at com.intellectualcrafters.plot.object.RunnableVal.run(RunnableVal.java:14) ~[?:?]
at com.intellectualcrafters.plot.util.ChunkManager$3.run(ChunkManager.java:182) ~[?:?]
at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot-1.9.4.jar:git-Spigot-c6871e2-0cd0397]
at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot-1.9.4.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:734) [spigot-1.9.4.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:399) [spigot-1.9.4.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:665) [spigot-1.9.4.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:564) [spigot-1.9.4.jar:git-Spigot-c6871e2-0cd0397]