error

mytown.util.exceptions.ProtectionParseException: Class identifier is invalid
        at mytown.protection.segment.Segment$Serializer.deserialize(Segment.java:249) ~[Segment$Serializer.class:?]
        at mytown.protection.segment.Segment$Serializer.deserialize(Segment.java:136) ~[Segment$Serializer.class:?]
        at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:58) ~[TreeTypeAdapter.class:?]
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40) ~[TypeAdapterRuntimeTypeWrapper.class:?]
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81) ~[CollectionTypeAdapterFactory$Adapter.class:?]
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60) ~[CollectionTypeAdapterFactory$Adapter.class:?]
        at com.google.gson.Gson.fromJson(Gson.java:803) ~[Gson.class:?]
        at com.google.gson.Gson.fromJson(Gson.java:868) ~[Gson.class:?]
        at com.google.gson.Gson$1.deserialize(Gson.java:126) ~[Gson$1.class:?]
        at mytown.protection.json.Protection$Serializer.deserialize(Protection.java:75) ~[Protection$Serializer.class:?]
        at mytown.protection.json.Protection$Serializer.deserialize(Protection.java:34) ~[Protection$Serializer.class:?]
        at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:58) ~[TreeTypeAdapter.class:?]
        at com.google.gson.Gson.fromJson(Gson.java:803) ~[Gson.class:?]
        at com.google.gson.Gson.fromJson(Gson.java:741) ~[Gson.class:?]
        at mytown.protection.json.ProtectionParser.read(ProtectionParser.java:85) ~[ProtectionParser.class:?]
        at mytown.protection.json.ProtectionParser.start(ProtectionParser.java:57) ~[ProtectionParser.class:?]
        at mytown.MyTown.loadConfigs(MyTown.java:171) ~[MyTown.class:?]
        at mytown.commands.CommandsAdmin.configReloadCommand(CommandsAdmin.java:74) ~[CommandsAdmin.class:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_60]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_60]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_60]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_60]
        at mypermissions.command.CommandTreeNode.commandCall(CommandTreeNode.java:72) ~[CommandTreeNode.class:?]
        at mypermissions.command.CommandTree.commandCall(CommandTree.java:40) ~[CommandTree.class:?]
        at mypermissions.command.CommandModel.func_71515_b(CommandModel.java:46) ~[CommandModel.class:?]
        at net.minecraft.command.CommandHandler.func_71556_a(CommandHandler.java:94) [z.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71333_ah(DedicatedServer.java:370) [lt.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:335) [lt.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]