The JSON is valid

{
  "Avatars - Store player avatars": false,
  "Steam API key (get one here https://steamcommunity.com/dev/apikey)": "",
  "URL to web folder containing all item icons": "https://www.rustedit.io/images/imagelibrary/",
  "Progress - Show download progress in console": true,
  "Progress - Time between update notifications": 20,
  "User Images - Manually define images to be loaded": {},
  "Version": {
    "Major": 2,
    "Minor": 0,
    "Patch": 65
  }
}

but after updating to Oxide version 7515 or higher, I get the following error:

[Error] Web request callback raised an exception (JsonReaderException: Unexpected character encountered while parsing value: E. Path '', line 0, position 0.) at Newtonsoft.Json.JsonTextReader.ParseValue () [0x002b3] in <271c58b7a8684db5a2c92be17a81f252>:0 at Newtonsoft.Json.JsonTextReader.Read () [0x0004c] in <271c58b7a8684db5a2c92be17a81f252>:0 at Newtonsoft.Json.JsonReader.ReadAndMoveToContent () [0x00000] in <271c58b7a8684db5a2c92be17a81f252>:0 at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadForType (Newtonsoft.Json.JsonReader reader, Newtonsoft.Json.Serialization.JsonContract contract, System.Boolean hasConverter) [0x00043] 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 Newtonsoft.Json.JsonConvert.DeserializeObject[T] (System.String value) [0x00000] in <271c58b7a8684db5a2c92be17a81f252>:0 at Oxide.Plugins.ImageLibrary.b__24_0 (System.Int32 code, System.String response) [0x00000] in :0 at Oxide.Core.Libraries.WebRequests+WebRequest.b__46_0 () [0x00034] in <15f61ddda771464d8246ebdce8ff4811>:0