java.util.concurrent.ConcurrentLinkedQueue cannot be cast to io.netty.channel.Channel

Hi,

I have fully compiled and loaded your plugin on a 1.8.6 Spigot server. However, after the use of the /fp set or /fp multiset command, I get this error and results in no picture displayed on the item frames :

java.lang.ClassCastException: java.util.concurrent.ConcurrentLinkedQueue cannot be cast to io.netty.channel.Channel
at de.howaner.FramePicture.util.Utils.sendPacketFast(Utils.java:70) [Jackobo-Minecraft-Spigot-FramePicture.jar:?]
at de.howaner.FramePicture.util.PacketSender.run(PacketSender.java:19) [Jackobo-Minecraft-Spigot-FramePicture.jar:?]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) [minecraft_server.jar:git-Spigot-6a6b839-b0e81a4]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [minecraft_server.jar:git-Spigot-6a6b839-b0e81a4]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:726) [minecraft_server.jar:git-Spigot-6a6b839-b0e81a4]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367) [minecraft_server.jar:git-Spigot-6a6b839-b0e81a4]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657) [minecraft_server.jar:git-Spigot-6a6b839-b0e81a4]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [minecraft_server.jar:git-Spigot-6a6b839-b0e81a4]
at java.lang.Thread.run(Thread.java:745) [?:1.7.0_75]

This line in the file Utils.java is the problem : "Channel channel = (Channel) field.get(netty);"

Have you a suggestion to solve this issue? I can test it too and send you a patch to add Spigot 1.8.6 support in your plugin if you want ;)

Here is the result after the use of the command : /fp multiset http://fc07.deviantart.net/fs70/f/2010/300/7/6/neko_girl_by_kaguyananbufan-d31m7re.jpg