Having a spinner when using MustAsync

[HeyBigAl]

Hi,

I have in my Blazor Web Assembly application a validator defined as follows:

public class Validator : AbstractValidator
{
public Validator(WSRequester wsRequester, Action activateSpinner, Action deactivateSpinner)
{
var loc = new OrderMessagesLocalizer();

	When(m => m.PORequired == 1 && (!string.IsNullOrWhiteSpace(m.LabelCustomerPO) ||
		!string.IsNullOrWhiteSpace(m.LabelBOLPO)), () =>
	{
		RuleFor(m => m.CustomerPO).NotEmpty()
			.WithMessage(loc[nameof(Resources.Orders.CustomerPORequired)]);
	});
	
	When(w => w.TransactionType == DTOTransactionHeader.TransactionTypeId.LiquidReturn, () =>
	{
		RuleFor(r => r.OriginalOrder)
			.NotEmpty()
			.WithMessage(loc[nameof(Resources.Orders.ExistingOriginalOrderNumberRequired)])
			.MustAsync(async (originalOrder, cancellation) =>
			{
				int order;

				if (Int32.TryParse(originalOrder, out order))
				{                                
					activateSpinner?.Invoke(loc[nameof(Resources.Orders.ValidationOrderNo)]);

					try
					{
						var result = await wsRequester.GetReturnAsync(
							0, (int)DTOTransactionHeader.TransactionTypeId.LiquidSale, 0, order);

						if (result.RequestResult == WSRequester.RequestResult.Success)
						{
							return result.DTOReturn.Any();
						}

						return false;
					}
					finally
					{
						deactivateSpinner?.Invoke();
					}
				}

				return true;
			})
			.WithMessage(loc[nameof(Resources.Orders.ExistingOriginalOrderNumberRequired)]);
	});
}	
}

}

One of the goal of my validator is for a specific scenario, I need to call a web service to validate an order
number. For this specific scenario, I need to display a spinner before the call and hide the spinner after the call.

When the application reach the validator constructor, I received the following error message:

System.InvalidOperationException: Unable to resolve service for type 'System.Action`1[System.String]' while attempting to activate 'OrderEntryUI.Models.OrderGeneralModel+Validator'.

Regards
Al