I am getting the following error when loading this plugin:

Failed to initialize plugin 'PersonalHeli v1.1.8' (JsonReaderException: Additional text encountered after finished reading JSON content: }. Path '', line 4, position 0.)
at Newtonsoft.Json.JsonTextReader.Read () [0x000c8] in <271c58b7a8684db5a2c92be17a81f252>:0
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize (Newtonsoft.Json.JsonReader reader, System.Type objectType, System.Boolean checkAdditionalContent) [0x000d9] in <271c58b7a8684db5a2c92be17a81f252>:0
at Newtonsoft.Json.JsonSerializer.DeserializeInternal (Newtonsoft.Json.JsonReader reader, System.Type objectType) [0x00053] in <271c58b7a8684db5a2c92be17a81f252>:0
at Newtonsoft.Json.JsonSerializer.Deserialize (Newtonsoft.Json.JsonReader reader, System.Type objectType) [0x00000] in <271c58b7a8684db5a2c92be17a81f252>:0
at Newtonsoft.Json.JsonConvert.DeserializeObject (System.String value, System.Type type, Newtonsoft.Json.JsonSerializerSettings settings) [0x0002d] in <271c58b7a8684db5a2c92be17a81f252>:0
at Newtonsoft.Json.JsonConvert.DeserializeObject[T] (System.String value, Newtonsoft.Json.JsonSerializerSettings settings) [0x00000] in <271c58b7a8684db5a2c92be17a81f252>:0
at Oxide.Core.Configuration.DynamicConfigFile.ReadObject[T] (System.String filename) [0x00028] in <157a94ee66ab4a7991faecd1eb84be3b>:0
at Oxide.Core.DataFileSystem.ReadObject[T] (System.String name) [0x00021] in <157a94ee66ab4a7991faecd1eb84be3b>:0
at Oxide.Plugins.PersonalHeli.LoadData () [0x00011] in <8f1cf498f49645a4820caa34a2976178>:0
at Oxide.Plugins.PersonalHeli.Init () [0x0006a] in <8f1cf498f49645a4820caa34a2976178>:0
at Oxide.Plugins.PersonalHeli.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x000d6] in <8f1cf498f49645a4820caa34a2976178>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <23ba99f131254889867c71f0bd137b1d>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <157a94ee66ab4a7991faecd1eb84be3b>:0
at Oxide.Core.Plugins.CSPlugin.HandleAddedToManager (Oxide.Core.Plugins.PluginManager manager) [0x00043] in <157a94ee66ab4a7991faecd1eb84be3b>:0

I checked the json and there are no characters (hidden or not) after the }

Please using https://jsonformatter.curiousconcept.com/

It says it is a valid json

{
"UseFriends": true,
"UseTeams": true,
"UseClans": true,
"CooldownSeconds": 1800,
"ChatCommand": "callheli",
"ResetCooldownsOnWipe": true,
"MemorizeTeamOnCall": true,
"RetireOnAllTeamDead": false,
"DenyCratesLooting": true,
"DenyGibsMining": true,
"RemoveFireFromCrates": true
}

Taracmeden

It says it is a valid json

Please remove data/PersonalHeli.json