not working

Failed to call hook 'cmdOutpost' on plugin 'TownTeleport v1.3.0' (JsonSerializationException: Unexpected end when deserializing object. Path 'NoPermission', line 16, position 124.)
  at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ThrowUnexpectedEndException (Newtonsoft.Json.JsonReader reader, Newtonsoft.Json.Serialization.JsonContract contract, System.Object currentObject, System.String message) [0x0002d] in <8fe7f8665ff548909c2f26d557e5093a>:0

  at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateDictionary (System.Collections.IDictionary dictionary, Newtonsoft.Json.JsonReader reader, Newtonsoft.Json.Serialization.JsonDictionaryContract contract, Newtonsoft.Json.Serialization.JsonProperty containerProperty, System.String id) [0x0029a] in <8fe7f8665ff548909c2f26d557e5093a>:0

  at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject (Newtonsoft.Json.JsonReader reader, System.Type objectType, Newtonsoft.Json.Serialization.JsonContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerMember, System.Object existingValue) [0x002a8] in <8fe7f8665ff548909c2f26d557e5093a>:0

  at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal (Newtonsoft.Json.JsonReader reader, System.Type objectType, Newtonsoft.Json.Serialization.JsonContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerMember, System.Object existingValue) [0x0006d] in <8fe7f8665ff548909c2f26d557e5093a>:0

  at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize (Newtonsoft.Json.JsonReader reader, System.Type objectType, System.Boolean checkAdditionalContent) [0x000d9] in <8fe7f8665ff548909c2f26d557e5093a>:0

  at Newtonsoft.Json.JsonSerializer.DeserializeInternal (Newtonsoft.Json.JsonReader reader, System.Type objectType) [0x00053] in <8fe7f8665ff548909c2f26d557e5093a>:0

  at Newtonsoft.Json.JsonSerializer.Deserialize (Newtonsoft.Json.JsonReader reader, System.Type objectType) [0x00000] in <8fe7f8665ff548909c2f26d557e5093a>:0

  at Newtonsoft.Json.JsonConvert.DeserializeObject (System.String value, System.Type type, Newtonsoft.Json.JsonSerializerSettings settings) [0x0002d] in <8fe7f8665ff548909c2f26d557e5093a>:0

  at Newtonsoft.Json.JsonConvert.DeserializeObject[T] (System.String value, Newtonsoft.Json.JsonSerializerSettings settings) [0x00000] in <8fe7f8665ff548909c2f26d557e5093a>:0

  at Newtonsoft.Json.JsonConvert.DeserializeObject[T] (System.String value) [0x00000] in <8fe7f8665ff548909c2f26d557e5093a>:0

  at Oxide.Core.Libraries.Lang.GetMessageFile (System.String plugin, System.String lang) [0x00067] in <4452f821def6406d834e4149849fe7ea>:0

  at Oxide.Core.Libraries.Lang.GetMessageKey (System.String key, Oxide.Core.Plugins.Plugin plugin, System.String lang) [0x00047] in <4452f821def6406d834e4149849fe7ea>:0

  at Oxide.Core.Libraries.Lang.GetMessage (System.String key, Oxide.Core.Plugins.Plugin plugin, System.String userId) [0x00017] in <4452f821def6406d834e4149849fe7ea>:0

  at Oxide.Plugins.TownTeleport.Lang (System.String key, System.String id, System.Object[] args) [0x00000] in <6a6dcf979bed4bcbbded6a9925c24075>:0

  at Oxide.Plugins.TownTeleport.CanTownTeleport (BasePlayer player, System.String town, System.Boolean checkTimers) [0x0002c] in <6a6dcf979bed4bcbbded6a9925c24075>:0

  at Oxide.Plugins.TownTeleport.cmdOutpost (BasePlayer player) [0x00000] in <6a6dcf979bed4bcbbded6a9925c24075>:0

  at Oxide.Plugins.TownTeleport.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00233] in <6a6dcf979bed4bcbbded6a9925c24075>:0

  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9affce1cd15c4ec183941adef8db1722>:0

  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <4452f821def6406d834e4149849fe7ea>:0

  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <4452f821def6406d834e4149849fe7ea>:0

Did you edit the oxide/lang file for the plugin? That's an error with your lang file where the file is invalid JSON.