Can someone help me my mindcrack server keeps getting this error in console
14:12:14 [SEVERE] Could not pass event BlockPlaceEvent to ChestShop v3.5
15:12:14 org.bukkit.event.EventException
15:12:14 at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:363)
15:12:14 at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
15:12:14 at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
15:12:14 at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
15:12:14 at org.bukkit.craftbukkit.v1_4_R1.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:82)
15:12:14 at vq.processBlockPlace(ItemBlock.java:134)
15:12:14 at vq.a(ItemBlock.java:116)
15:12:14 at ur.a(ItemStack.java:135)
15:12:14 at ir.a(ItemInWorldManager.java:580)
15:12:14 at iv.a(NetServerHandler.java:906)
15:12:14 at fk.a(Packet15Place.java:79)
15:12:14 at cg.b(TcpConnection.java:467)
15:12:14 at iv.d(NetServerHandler.java:220)
15:12:14 at iw.b(NetworkListenThread.java:57)
15:12:14 at ht.b(DedicatedServerListenThread.java:34)
15:12:14 at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:981)
15:12:14 at ho.r(DedicatedServer.java:309)
15:12:14 at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:857)
15:12:14 at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:744)
15:12:14 at fy.run(ThreadMinecraftServer.java:16)
15:12:14 Caused by: java.lang.NoSuchFieldError: HOPPER
15:12:14 at com.Acrobot.ChestShop.Listeners.Block.BlockPlace.onHopperDropperPlace(Unknown Source)
15:12:14 at sun.reflect.GeneratedMethodAccessor165.invoke(Unknown Source)
15:12:14 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
15:12:14 at java.lang.reflect.Method.invoke(Method.java:601)
15:12:14 at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:361)
15:12:14 ... 19 more
15:12:15 [SEVERE] Could not pass event BlockPlaceEvent to ChestShop v3.5
15:12:15 org.bukkit.event.EventException
15:12:15 at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:363)
15:12:15 at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
15:12:15 at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
15:12:15 at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
15:12:15 at org.bukkit.craftbukkit.v1_4_R1.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:82)
15:12:15 at vq.processBlockPlace(ItemBlock.java:134)
15:12:15 at vq.a(ItemBlock.java:116)
15:12:15 at ur.a(ItemStack.java:135)
15:12:15 at ir.a(ItemInWorldManager.java:580)
15:12:15 at iv.a(NetServerHandler.java:906)
15:12:15 at fk.a(Packet15Place.java:79)
15:12:15 at cg.b(TcpConnection.java:467)
15:12:15 at iv.d(NetServerHandler.java:220)
15:12:15 at iw.b(NetworkListenThread.java:57)
15:12:15 at ht.b(DedicatedServerListenThread.java:34)
15:12:15 at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:981)
15:12:15 at ho.r(DedicatedServer.java:309)
15:12:15 at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:857)
15:12:15 at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:744)
15:12:15 at fy.run(ThreadMinecraftServer.java:16)
15:12:15 Caused by: java.lang.NoSuchFieldError: HOPPER
15:12:15 at com.Acrobot.ChestShop.Listeners.Block.BlockPlace.onHopperDropperPlace(Unknown Source)
15:12:15 at sun.reflect.GeneratedMethodAccessor165.invoke(Unknown Source)
15:12:15 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
15:12:15 at java.lang.reflect.Method.invoke(Method.java:601)
15:12:15 at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:361)
15:12:15 ... 19 more
14:12:14 [SEVERE] Could not pass event BlockPlaceEvent to ChestShop v3.5
15:12:14 org.bukkit.event.EventException
15:12:14 at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:363)
15:12:14 at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
15:12:14 at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
15:12:14 at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
15:12:14 at org.bukkit.craftbukkit.v1_4_R1.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:82)
15:12:14 at vq.processBlockPlace(ItemBlock.java:134)
15:12:14 at vq.a(ItemBlock.java:116)
15:12:14 at ur.a(ItemStack.java:135)
15:12:14 at ir.a(ItemInWorldManager.java:580)
15:12:14 at iv.a(NetServerHandler.java:906)
15:12:14 at fk.a(Packet15Place.java:79)
15:12:14 at cg.b(TcpConnection.java:467)
15:12:14 at iv.d(NetServerHandler.java:220)
15:12:14 at iw.b(NetworkListenThread.java:57)
15:12:14 at ht.b(DedicatedServerListenThread.java:34)
15:12:14 at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:981)
15:12:14 at ho.r(DedicatedServer.java:309)
15:12:14 at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:857)
15:12:14 at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:744)
15:12:14 at fy.run(ThreadMinecraftServer.java:16)
15:12:14 Caused by: java.lang.NoSuchFieldError: HOPPER
15:12:14 at com.Acrobot.ChestShop.Listeners.Block.BlockPlace.onHopperDropperPlace(Unknown Source)
15:12:14 at sun.reflect.GeneratedMethodAccessor165.invoke(Unknown Source)
15:12:14 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
15:12:14 at java.lang.reflect.Method.invoke(Method.java:601)
15:12:14 at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:361)
15:12:14 ... 19 more
15:12:15 [SEVERE] Could not pass event BlockPlaceEvent to ChestShop v3.5
15:12:15 org.bukkit.event.EventException
15:12:15 at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:363)
15:12:15 at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
15:12:15 at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
15:12:15 at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
15:12:15 at org.bukkit.craftbukkit.v1_4_R1.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:82)
15:12:15 at vq.processBlockPlace(ItemBlock.java:134)
15:12:15 at vq.a(ItemBlock.java:116)
15:12:15 at ur.a(ItemStack.java:135)
15:12:15 at ir.a(ItemInWorldManager.java:580)
15:12:15 at iv.a(NetServerHandler.java:906)
15:12:15 at fk.a(Packet15Place.java:79)
15:12:15 at cg.b(TcpConnection.java:467)
15:12:15 at iv.d(NetServerHandler.java:220)
15:12:15 at iw.b(NetworkListenThread.java:57)
15:12:15 at ht.b(DedicatedServerListenThread.java:34)
15:12:15 at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:981)
15:12:15 at ho.r(DedicatedServer.java:309)
15:12:15 at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:857)
15:12:15 at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:744)
15:12:15 at fy.run(ThreadMinecraftServer.java:16)
15:12:15 Caused by: java.lang.NoSuchFieldError: HOPPER
15:12:15 at com.Acrobot.ChestShop.Listeners.Block.BlockPlace.onHopperDropperPlace(Unknown Source)
15:12:15 at sun.reflect.GeneratedMethodAccessor165.invoke(Unknown Source)
15:12:15 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
15:12:15 at java.lang.reflect.Method.invoke(Method.java:601)
15:12:15 at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:361)
15:12:15 ... 19 more