{"success":false,"data":{"ClassName":"System.ArgumentNullException","Message":"String reference not set to an instance of a String.","Data":null,"InnerException":null,"HelpURL":null,"StackTraceString":"   at System.Text.Encoding.GetBytes(String s)\n   at ch2.StringExtenstion.AsBase64UrlValue(String input) in /src/ch2.Common/Extenstions/StringExtenstions.cs:line 220\n   at ch2.Web.Controllers.XaAuthController.SignIn(String returnUrl) in /src/ch2.Web/Controllers/XaAuthController.cs:line 26\n   at lambda_method(Closure , Object , Object[] )\n   at Microsoft.Extensions.Internal.ObjectMethodExecutor.Execute(Object target, Object[] parameters)\n   at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.SyncActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeActionMethodAsync()\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeNextActionFilterAsync()","RemoteStackTraceString":null,"RemoteStackIndex":0,"ExceptionMethod":null,"HResult":-2147467261,"Source":"System.Private.CoreLib","WatsonBuckets":null,"ParamName":"s"},"code":500,"message":"String reference not set to an instance of a String.\nParameter name: s","time":"2026-07-04T21:24:34.3358483+00:00"}