我正在尝试创建C代码的exe文件，并使用此设置在一个文件中创建它。但是，它在恢复csproj时失败，并返回此错误消息：

Build started...
1>------ Build started: Project: Email-gen, Configuration: Release Any CPU ------
1>Email-gen -> C:\Users\Mohammed\source\repos\Email-gen\Email-gen\bin\Release\net6.0\Email-gen.dll
2>------ Publish started: Project: Email-gen, Configuration: Release Any CPU ------
2>Determining projects to restore...
2>Unable to find package Microsoft.NETCore.App.Runtime.win-x64. No packages exist with this id in source(s): Microsoft Visual Studio Offline Packages
2>Unable to find package Microsoft.WindowsDesktop.App.Runtime.win-x64. No packages exist with this id in source(s): Microsoft Visual Studio Offline Packages
2>Unable to find package Microsoft.AspNetCore.App.Runtime.win-x64. No packages exist with this id in source(s): Microsoft Visual Studio Offline Packages
2>Failed to restore C:\Users\Mohammed\source\repos\Email-gen\Email-gen\Email-gen.csproj (in 774 ms).
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
========== Publish: 0 succeeded, 1 failed, 0 skipped ==========

这个csproj文件：

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
    <RootNamespace>Email_gen</RootNamespace>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

</Project>