Register ExceptionHandler and ApplicationExceptionHandler

Startup.cs

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        .
        .
        services.AddSingleton<IExceptionHandler, ExceptionHandler>();
        .
        .
      
    }
    
    public void Configure(IApplicationBuilder app)
    {
        app.UseMiddleware<ApplicationExceptionMiddleware>();
        .
        .       
    }
}