[BUG]ELsa3.0.3 Studio bug

[cuong21951]

Error: System.NullReferenceException: Object reference not set to an instance of an object. at Elsa.Studio.Login.Services.DefaultCredentialsValidator.ValidateCredentialsAsync(String username, String password, CancellationToken cancellationToken) at Elsa.Studio.Login.Pages.Login.Login.ValidateCredentials(String username, String password) at Elsa.Studio.Login.Pages.Login.Login.TryLogin() at Elsa.Studio.Components.StudioComponentBase.CallStateHasChangedOnAsyncCompletion(Task task) at Elsa.Studio.Components.StudioComponentBase.InvokeWithBlazorServiceContext(Func`1 func) at Microsoft.AspNetCore.Components.Forms.EditForm.HandleSubmitAsync() at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task) at Microsoft.AspNetCore.Components.RenderTree.Rend I got this when trying to connecto the server. I'm using Elsa Blazor Server.