error

> [20:54:24 WARN]: [Factions] Task #7801 for Factions v1.6.9.5-U0.2.1-SNAPSHOT-SF-1.0.4 generated an exception
com.massivecraft.factions.util.Particle.ParticleEffect$ParticlePacket$VersionIncompatibleException: Your current bukkit version seems to be incompatible with this library
at com.massivecraft.factions.util.Particle.ParticleEffect$ParticlePacket.initialize(ParticleEffect.java:1400) ~[?:?]
at com.massivecraft.factions.util.Particle.ParticleEffect$ParticlePacket.<init>(ParticleEffect.java:1348) ~[?:?]
at com.massivecraft.factions.util.Particle.ParticleEffect.display(ParticleEffect.java:574) ~[?:?]
at com.massivecraft.factions.cmd.CmdFly$1.run(CmdFly.java:67) ~[?:?]
at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftTask.run(CraftTask.java:71) ~[server.jar:git-Spigot-c3e4052-1953f52]
at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [server.jar:git-Spigot-c3e4052-1953f52]
at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:741) [server.jar:git-Spigot-c3e4052-1953f52]
at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:399) [server.jar:git-Spigot-c3e4052-1953f52]
at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:672) [server.jar:git-Spigot-c3e4052-1953f52]
at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:571) [server.jar:git-Spigot-c3e4052-1953f52]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_10_R1.Packet63WorldParticles
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[server.jar:git-Spigot-c3e4052-1953f52]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[server.jar:git-Spigot-c3e4052-1953f52]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_151]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_151]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_151]
at java.lang.Class.forName(Class.java:264) ~[?:1.8.0_151]
at com.massivecraft.factions.util.Particle.ReflectionUtils$PackageType.getClass(ReflectionUtils.java:411) ~[?:?]
at com.massivecraft.factions.util.Particle.ParticleEffect$ParticlePacket.initialize(ParticleEffect.java:1394) ~[?:?]
... 10 more