Could not initialize plugin

Plugin has been working normally all the time. Today, it suddenly works like this:

(19:06:50) | Shop was compiled successfully in 1978ms
(19:06:50) | Unloaded plugin Shop v1.0.18 by Mevent
(19:06:50) | Could not initialize plugin 'Shop v1.0.18' (JsonReaderException: Unexpected character encountered while parsing value: [. Path 'Commands', line 2, position 15.)
  at Newtonsoft.Json.JsonTextReader.ReadStringValue (Newtonsoft.Json.ReadType readType) [0x00366] in <2ae3f091decd4989b3c4d466e6eb5985>:0 
  at Newtonsoft.Json.JsonTextReader.ReadAsString () [0x00000] in <2ae3f091decd4989b3c4d466e6eb5985>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadForType (Newtonsoft.Json.JsonReader reader, Newtonsoft.Json.Serialization.JsonContract contract, System.Boolean hasConverter) [0x00077] in <2ae3f091decd4989b3c4d466e6eb5985>: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) [0x00262] in <2ae3f091decd4989b3c4d466e6eb5985>: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 <2ae3f091decd4989b3c4d466e6eb5985>: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 <2ae3f091decd4989b3c4d466e6eb5985>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize (Newtonsoft.Json.JsonReader reader, System.Type objectType, System.Boolean checkAdditionalContent) [0x000d9] in <2ae3f091decd4989b3c4d466e6eb5985>:0 
  at Newtonsoft.Json.JsonSerializer.DeserializeInternal (Newtonsoft.Json.JsonReader reader, System.Type objectType) [0x00053] in <2ae3f091decd4989b3c4d466e6eb5985>:0 
  at Newtonsoft.Json.JsonSerializer.Deserialize (Newtonsoft.Json.JsonReader reader, System.Type objectType) [0x00000] in <2ae3f091decd4989b3c4d466e6eb5985>:0 
  at Newtonsoft.Json.JsonConvert.DeserializeObject (System.String value, System.Type type, Newtonsoft.Json.JsonSerializerSettings settings) [0x0002d] in <2ae3f091decd4989b3c4d466e6eb5985>:0 
  at Newtonsoft.Json.JsonConvert.DeserializeObject[T] (System.String value, Newtonsoft.Json.JsonSerializerSettings settings) [0x00000] in <2ae3f091decd4989b3c4d466e6eb5985>:0 
  at Newtonsoft.Json.JsonConvert.DeserializeObject[T] (System.String value) [0x00000] in <2ae3f091decd4989b3c4d466e6eb5985>:0 
  at Oxide.Core.Libraries.Lang.GetMessageFile (System.String plugin, System.String lang) [0x00067] in <0fbce81d88d64454b3e7abb24df7026b>:0 
  at Oxide.Core.Libraries.Lang.RegisterMessages (System.Collections.Generic.Dictionary`2[TKey,TValue] messages, Oxide.Core.Plugins.Plugin plugin, System.String lang) [0x00032] in <0fbce81d88d64454b3e7abb24df7026b>:0 
  at Oxide.Plugins.Shop.LoadDefaultMessages () [0x0034c] in <9ba934d446644add92aeb00be263e107>:0 
  at Oxide.Core.Plugins.Plugin.HandleAddedToManager (Oxide.Core.Plugins.PluginManager manager) [0x0001d] in <0fbce81d88d64454b3e7abb24df7026b>:0 
  at Oxide.Core.Plugins.CSPlugin.HandleAddedToManager (Oxide.Core.Plugins.PluginManager manager) [0x00000] in <0fbce81d88d64454b3e7abb24df7026b>:0 
  at Oxide.Plugins.CSharpPlugin.HandleAddedToManager (Oxide.Core.Plugins.PluginManager manager) [0x00000] in <31122a27a2414cd799150f8677cf39d4>:0 
  at Oxide.Plugins.RustPlugin.HandleAddedToManager (Oxide.Core.Plugins.PluginManager manager) [0x0028e] in <da3c0a2bb476414eb2109ec5dc4da7b2>:0 
  at Oxide.Core.Plugins.PluginManager.AddPlugin (Oxide.Core.Plugins.Plugin plugin) [0x00027] in <0fbce81d88d64454b3e7abb24df7026b>:0 
  at Oxide.Core.OxideMod.PluginLoaded (Oxide.Core.Plugins.Plugin plugin) [0x00035] in <0fbce81d88d64454b3e7abb24df7026b>:0
(19:06:50) | No previous version to rollback plugin: Shop

@Mevent I restarted my server and used the default JSON config, still same problem.
Can you help me see what the problem is?

It has been solved. I accidentally put the wrong JSON into "lang" .