asp.net-core – Services.AddOptions()含糊不清

使用IOptions< T>时RC2要求we configure the following：

services.AddOptions();

但是我得到以下编译错误：

Error CS0121 The call is ambiguous between the following methods or
properties:
‘Microsoft.Extensions.DependencyInjection.OptionsServiceCollectionExtensions.AddOptions(Microsoft.Extensions.DependencyInjection.IServiceCollection)’
and
‘Microsoft.Extensions.DependencyInjection.OptionsServiceCollectionExtensions.AddOptions(Microsoft.Extensions.DependencyInjection.IServiceCollection)’ TransitApi.Api..NET
Framework 4.5.2

这些是完全相同的扩展方法！我已经尝试删除所有软件包并删除锁定文件,但无济于事.

project.json：

{
  "title": "MyProject.Api","webroot": "wwwroot","version": "1.0.0-*","dependencies": {

    "Microsoft.ApplicationInsights.AspNetCore": "1.0.0-rc2-final","Microsoft.AspNetCore.Mvc": "1.0.0-rc2-final","Microsoft.AspNetCore.Server.Kestrel": "1.0.0-rc2-final","Microsoft.AspNetCore.Diagnostics": "1.0.0-rc2-final","Microsoft.AspNetCore.Authorization": "1.0.0-rc2-final","Microsoft.AspNetCore.Mvc.Core": "1.0.0-rc2-final","Microsoft.AspNetCore.Mvc.Abstractions": "1.0.0-rc2-final","Microsoft.AspNetCore.Authentication.JwtBearer": "1.0.0-rc2-final","Microsoft.Extensions.PlatformAbstractions": "1.0.0-rc2-final","Microsoft.AspNetCore.StaticFiles": "1.0.0-rc2-final","Microsoft.Extensions.Logging": "1.0.0-rc2-final","Microsoft.Extensions.Logging.Abstractions": "1.0.0-rc2-final","Microsoft.Extensions.Logging.Console": "1.0.0-rc2-final","Microsoft.AspNetCore.Http": "1.0.0-rc2-final","Microsoft.AspNetCore.Http.Abstractions": "1.0.0-rc2-final","Microsoft.Extensions.Configuration": "1.0.0-rc2-final","Microsoft.Extensions.Configuration.Json": "1.0.0-rc2-final","Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0-rc2-final","Microsoft.Extensions.Configuration.FileExtensions": "1.0.0-rc2-final","Newtonsoft.Json": "8.0.3","WindowsAzure.Storage": "7.0.0","Microsoft.AspNetCore.Mvc.Formatters.Json": "1.0.0-rc2-final","Microsoft.AspNetCore.Server.IISIntegration": "1.0.0-rc2-final","Microsoft.AspNetCore.Cors": "1.0.0-rc2-final"
  },"frameworks": {
    "net452": { }
  },"tools": {
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": {
      "version": "1.0.0-preview1-final","imports": "portable-net45+win8+dnxcore50"
    }
  },"buildOptions": {
    "emitEntryPoint": true,"preserveCompilationContext": true
  },"runtimeOptions": {
    "configProperties": {
      "System.GC.Server": true
    }
  },"publishOptions": {
    "include": [
      "wwwroot","appsettings.json","web.config"
    ]
  }
}