C# ASP.NET strange error when calling a method from the Class Library project

ASP.NET MVC / I use VkNet to publish records to a group in VK

At a certain time, the task scheduler makes a GET request with a key for a certain time.Action (https://mydomain.com/Service/Vk?key=SECRET_KEY)

After that, the logic Action is executed and at the end, the method responsible for working with VkNet is called:

VkontakteService.WallPost(APPID, "LOGIN", "PWD", OWNERID, message);

Method:

public static void WallPost(ulong appId, string login, string password, long ownerId, string message)
{
    try
    {
        VkApi api = new VkApi();
        api.Authorize(new ApiAuthParams
        {
            ApplicationId = appId,
            Login = login,
            Password = password,
            Settings = Settings.All
        });

        api.Wall.Post(new WallPostParams
        {
            OwnerId = ownerId,
            FromGroup = true,
            Message = message,
            Signed = false,
        });
    }
    catch (Exception ex)
    {
        Log.Error($"Ошибка при добавлении записи в группу ВК: {ex}");
    }
}

As a result, I get a strange Exception:

[2016-11-21 23:13:11.3353][Error]: Ошибка при добавлении записи в группу ВК: Could not load file or assembly 'Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
System.IO.FileLoadException: Could not load file or assembly 'Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
File name: 'Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed'
   at VkNet.VkApi.Call(String methodName, VkParameters parameters, Boolean skipAuthorization)
   at VkNet.Categories.WallCategory.Post(WallPostParams params)
   at MyProject.Services.VkontakteService.WallPost(UInt64 appId, String login, String password, Int64 ownerId, String message) in D:\MyProject\trunk\Sources\MyProject.Services\VkontakteService.cs:line 27

=== Pre-bind state information ===
LOG: DisplayName = Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed
 (Fully-specified)
LOG: Appbase = file:///D:/MyProject/trunk/Sources/MyProject.Host/
LOG: Initial PrivatePath = D:\MyProject\trunk\Sources\MyProject.Host\bin
Calling assembly : VkNet, Version=1.21.0.0, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: D:\MyProject\trunk\Sources\MyProject.Host\web.config
LOG: Using host configuration file: C:\Users\Home\Documents\IISExpress\config\aspnet.config
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config.
LOG: Post-policy reference: Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed
LOG: Attempting download of new URL file:///C:/Users/Home/AppData/Local/Temp/Temporary ASP.NET Files/root/ee02bc37/45707ec2/Newtonsoft.Json.DLL.
LOG: Attempting download of new URL file:///C:/Users/Home/AppData/Local/Temp/Temporary ASP.NET Files/root/ee02bc37/45707ec2/Newtonsoft.Json/Newtonsoft.Json.DLL.
LOG: Attempting download of new URL file:///D:/MyProject/trunk/Sources/MyProject.Host/bin/Newtonsoft.Json.DLL.
WRN: Comparing the assembly name resulted in the mismatch: Major Version
ERR: Failed to complete setup of assembly (hr = 0x80131040). Probing terminated.

The class itself VkontakteService with the method WallPost are stored in a neighboring project (Class Library) with VkNet connected

App.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
        <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    </configSections>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="HtmlAgilityPack" publicKeyToken="bd319b19eaf3b43a" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-1.4.9.5" newVersion="1.4.9.5" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

Tell me what could be the problem, maybe someone has encountered such errors, I just see such a strange log for the first time?