Argument 1: cannot convert from 'netsatis.entities.interfaces.ientity' to 'fluentvalidation.ivalidationcontext

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C#

Visual-Studio

I am trying to use validator tools, but one day ago I didn't get any errors about this entity thing and now I am getting an error about entity. What should I do in order to not get an error?

What I have tried:

public static class ValidatorTool
    {
        public static bool Validate(IValidator validator,IEntity entity)
        {
            bool result = true;
            var validationResult = validator.Validate(entity);
            if (!validationResult.IsValid)
            {
                string message = null;
                foreach (var error in validationResult.Errors)
                {
                    message += error.ErrorMessage+System.Environment.NewLine;
                }
                MessageBox.Show(message);
                result = false;
            }
            return result;