[11:55:21] [Server thread/INFO]: Aisteve issued server command: /questsadmin reload
[11:55:21] [Server thread/WARN]: 1 x 640 is invalid! You may need to update your quests.yml or actions.yml in accordance with https://bit.ly/2BkBNNN
[11:55:21] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'questsadmin' in plugin Quests v3.9.1-b86
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_241]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_241]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_241]
Caused by: java.lang.NoSuchMethodError: org.bukkit.Material.matchMaterial(Ljava/lang/String;Z)Lorg/bukkit/Material;
	at me.blackvein.quests.util.ItemUtil.processItemStack(ItemUtil.java:178) ~[?:?]
	at me.blackvein.quests.Quests.loadQuestStages(Quests.java:1880) ~[?:?]
	at me.blackvein.quests.Quests.loadQuests(Quests.java:1355) ~[?:?]
	at me.blackvein.quests.Quests.reloadQuests(Quests.java:1150) ~[?:?]
	at me.blackvein.quests.listeners.CmdExecutor.adminReload(CmdExecutor.java:888) ~[?:?]
	at me.blackvein.quests.listeners.CmdExecutor.questAdminCommandHandler(CmdExecutor.java:305) ~[?:?]
	at me.blackvein.quests.listeners.CmdExecutor.onCommand(CmdExecutor.java:86) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
	... 15 more