# Error in new .NET 6 project **URL:** \ **Category:** Get Help\ **Tags:** classic-universal-login-experience, login-experience\ **Created:** [January 19, 2023, 12:50am UTC](https://community.auth0.com/t/error-in-new-net-6-project/98461 "2023-01-19T00:50:44Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![kennethversaw](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/kennethversaw/32/7522_2.png) [@kennethversaw](https://community.auth0.com/u/kennethversaw)\ **Post date:** [January 19, 2023, 12:50am UTC](https://community.auth0.com/t/error-in-new-net-6-project/98461/1 "2023-01-19T00:50:44Z")
I am following the quick start guide with a brand new .NET 6 project. I can click Login and be taken to the Auth0 login dialog, but upon returning I receive this error: SecurityTokenSignatureKeyNotFoundException: IDX10503: Signature validation failed. Token does not have a kid. Keys tried: ‘System.Text.StringBuilder’. Exceptions caught: ‘System.Text.StringBuilder’. token: ‘System.IdentityModel.Tokens.Jwt.JwtSecurityToken’. System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler.ValidateSignature(string token, TokenValidationParameters validationParameters) Exception: An error was encountered while handling the remote login. Microsoft.AspNetCore.Authentication.RemoteAuthenticationHandler.HandleRequestAsync() Please help ---
**Author:** ![konrad.sopala](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/konrad.sopala/32/13516_2.png) [@konrad.sopala](https://community.auth0.com/u/konrad.sopala)\ **Post date:** [January 19, 2023, 10:22am UTC](https://community.auth0.com/t/error-in-new-net-6-project/98461/2 "2023-01-19T10:22:28Z")
Hey there! Can you share a link to the quickstart so we can help you troubleshoot that? Thank you! ---
**Author:** ![kennethversaw](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/kennethversaw/32/7522_2.png) [@kennethversaw](https://community.auth0.com/u/kennethversaw)\ **Post date:** [January 19, 2023, 10:47pm UTC](https://community.auth0.com/t/error-in-new-net-6-project/98461/4 "2023-01-19T22:47:06Z")
Sure thing. It is the [ASP.NET](http://ASP.NET) MVC Documentation here: [Auth0 ASP.NET Core MVC SDK Quickstarts: Add Login to your ASP.NET MVC application](https://auth0.com/docs/quickstart/webapp/aspnet-core/interactive) ---
**Author:** ![konrad.sopala](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/konrad.sopala/32/13516_2.png) [@konrad.sopala](https://community.auth0.com/u/konrad.sopala)\ **Post date:** [January 20, 2023, 10:51am UTC](https://community.auth0.com/t/error-in-new-net-6-project/98461/5 "2023-01-20T10:51:48Z")
Perfect! Thanks for sharing that! Can I ask you to raise it as a GitHub issue here: > **[Issues · auth0-samples/auth0-aspnetcore-mvc-samples](https://github.com/auth0-samples/auth0-aspnetcore-mvc-samples/issues)** > > Auth0 Integration Samples for ASP.NET Core MVC Web Applications - Issues · auth0-samples/auth0-aspnetcore-mvc-samples this way we’ll be able to handle it most effectively and work with the direct repo maintainers on it. Once you have a link to it make sure to share it here so we can ping them. Thank you! ---
**Author:** ![kennethversaw](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/kennethversaw/32/7522_2.png) [@kennethversaw](https://community.auth0.com/u/kennethversaw)\ **Post date:** [January 20, 2023, 10:46pm UTC](https://community.auth0.com/t/error-in-new-net-6-project/98461/6 "2023-01-20T22:46:03Z")
Thanks Konrad. I added this issue: > > > I cloned the project and pulled it to my local environment. I changed the Target… Framework to : > > \net6.0\ > > Then I ran the project. It started and clicked "Login". It took me to the Auth0 login window. After I clicked Login it returned: > > An unhandled exception occurred while processing the request. > SecurityTokenSignatureKeyNotFoundException: IDX10503: Signature validation failed. Token does not have a kid. Keys tried: 'System.Text.StringBuilder'. > Exceptions caught: > 'System.Text.StringBuilder'. > token: 'System.IdentityModel.Tokens.Jwt.JwtSecurityToken'. > System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler.ValidateSignature(string token, TokenValidationParameters validationParameters) > > Exception: An error was encountered while handling the remote login. > Microsoft.AspNetCore.Authentication.RemoteAuthenticationHandler\.HandleRequestAsync() I cloned the quickstart and changed it to use .net 6 and am seeing the same error. ---
**Author:** ![konrad.sopala](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/konrad.sopala/32/13516_2.png) [@konrad.sopala](https://community.auth0.com/u/konrad.sopala)\ **Post date:** [January 25, 2023, 5:42am UTC](https://community.auth0.com/t/error-in-new-net-6-project/98461/7 "2023-01-25T05:42:24Z")
Thanks for doing that! I’ll ping the repo maintainers in a few minutes! ---
**Author:** ![system](https://global.discourse-cdn.com/auth0/original/3X/b/5/b560f266932fcce5d57f09a6595bd50518cae3f3.jpeg) [@system](https://community.auth0.com/u/system)\ **Post date:** [February 8, 2023, 5:42am UTC](https://community.auth0.com/t/error-in-new-net-6-project/98461/8 "2023-02-08T05:42:52Z")
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