Can't return Json at ProductController.

[nguyentuananh921]

I am not sure if I forgot something step but I can't return json at Section 6 - DataTables API.
I got the Error message like that.

An unhandled exception occurred while processing the request.
MissingMethodException: Method not found: 'System.Runtime.CompilerServices.ConfiguredTaskAwaitable System.Threading.Tasks.Task.ConfigureAwait(System.Threading.Tasks.ConfigureAwaitOptions)'.
System.Text.Json.Serialization.Metadata.JsonTypeInfo.SerializeAsync(Stream utf8Json, T rootValue, CancellationToken cancellationToken, object rootValueBoxed)

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MissingMethodException: Method not found: 'System.Runtime.CompilerServices.ConfiguredTaskAwaitable System.Threading.Tasks.Task.ConfigureAwait(System.Threading.Tasks.ConfigureAwaitOptions)'.
System.Text.Json.Serialization.Metadata.JsonTypeInfo.SerializeAsync(Stream utf8Json, T rootValue, CancellationToken cancellationToken, object rootValueBoxed)
System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start(ref TStateMachine stateMachine)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start(ref TStateMachine stateMachine)
System.Text.Json.Serialization.Metadata.JsonTypeInfo.SerializeAsync(Stream utf8Json, T rootValue, CancellationToken cancellationToken, object rootValueBoxed)
System.Text.Json.Serialization.Metadata.JsonTypeInfo.SerializeAsObjectAsync(Stream utf8Json, object rootValue, CancellationToken cancellationToken)
System.Text.Json.JsonSerializer.SerializeAsync(Stream utf8Json, object value, Type inputType, JsonSerializerOptions options, CancellationToken cancellationToken)
Microsoft.AspNetCore.Mvc.Infrastructure.SystemTextJsonResultExecutor.ExecuteAsync(ActionContext context, JsonResult result)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|30_0<TFilter, TFilterAsync>(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext<TFilter, TFilterAsync>(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)

[jandakazah1990]

I've got same issue, u need to check Nupackages versions, it should be same in every project u r using it.

[jandakazah1990]

That's answer from teacher that helped me:
"In your MVC projects you are using NuGet packages version 8.0.0-preview.6.23329.4

But in the Razor Temp project, you are using NuGet packages version 8.0.0-preview.5.23280.1

You need to either update packages to compatible versions in ALL projects, or follow what was suggested in video 62 and delete the Razor Temp project."

[jandakazah1990]

If nothing helped u, u can download from here(github) Lecturer's code and install same version as they did