Invalid option '7.3' for /langversion. Use '/langversion:?' to list supported values in Asp.Net MVC

Dung Do Tien Aug 28 2021 213

Hi you guys,

I have a project in Asp.Net Framework 4.5 and I'm using VS 2019 to build my project but today I get an error CS1617  Invalid option '7.3' for /langversion. Use '/langversion:?' to list supported values

Severity    Code    Description    Project    File    Line    Suppression State
Error    CS1617    Invalid option '7.3' for /langversion. Use '/langversion:?' to list supported values.    DVG.Warning.Web    C:\Company\Projects\CSSM\Main\SourceAdmin\admin\DIG.Warning.Web\CSC    1    Active

I tried to clear and rebuild the project solution but it didn't work for me.

Anyone can help me to fix it?

Thanks for any suggestions.

Have 2 answer(s) found.
  • N

    Nguyễn Danh Bảo An Aug 28 2021

    Clean and Rebuild didn't work for me until I closed Visual Studio and deleted the .vs folder then re-opened, cleaned and rebuilt.

  • S

    Sandeep Kumar Aug 28 2021

    You can try to open Visual Studio Installer > 2019 > modify button -> choose Individual components tab.

    Select like in the image above and click Modify button and retry build your project.

    This way solved the issue for me.

Related Q&A May You Like

  1. GitHub remote: Support for password authentication was removed on August 13, 2021
  2. Error remote: Repository not found on GitHub when clone
  3. The SDK 'Microsoft.NET.Sdk.Web' specified could not be found
  4. Unable to prepare context: unable to evaluate symlinks in Dockerfile in Asp.net Core
  5. Connection refused 127.0.0.1:3306 in .Net Core and MySql
  6. The operation failed as details for project could not be loaded in Asp.net Core
  7. Cannot implicitly convert type 'bool' to 'System.Threading.Tasks.Task<bool>' in C# Asp.Net Core
  8. Assets file 'project.assets.json' not found in Asp.net Core
  9. Eror the DbContext of type cannot be pooled in Asp.Net Core
  10. Error field doesn't have a default value in FE Core & MySql
  11. Your startup project doesn't reference Microsoft.EntityFrameworkCore.Design
  12. How to set GIT Username and email global in local computer?
  13. How to undo merge GIT with some conflicts, still not pushed?
  14. Denied: access forbidden in gitlab cicd with .net 6
  15. Git error fatal: cannot do a partial commit during a merge
Leave An Answer
* NOTE: You need Login before leave an answer

* Type maximum 2000 characters.

* All comments have to wait approved before display.

* Please polite comment and respect questions and answers of others.

Most Quizs Popular

Start Test

Javascript - Functions
Start Test

Asp.Net Core - Exam test 01
Start Test

Asp.Net Core - Exam test 02
Start Test

C# - Level Beginner

Popular Tips

This site uses cookies so that we can remember you and understand how you interact with our website. This allows us to improve and customize your browsing experience. See our Cookies Policy.
X Close