Upgrade Solution to use FluentValidation Ver 10 Exception Issue

Please I need your help to solve FluentValidation issue. I have an old desktop application which I wrote a few years ago. I used FluentValidation Ver 4 and Now I'm trying to upgrade this application to use .Net framework 4.8 and FluentValidation Ver 10, but unfortunately, I couldn't continue because of an exception that I still cannot fix.

I have this customer class:

    class Customer : MyClassBase
    {
        string _CustomerName = string.Empty;
        public string CustomerName
        {
            get { return _CustomerName; }
            set
            {
                if (_CustomerName == value)
                    return;

                _CustomerName = value;
            }
        }


        class CustomerValidator : AbstractValidator<Customer>
        {
            public CustomerValidator()
            {
                RuleFor(obj => obj.CustomerName).NotEmpty().WithMessage("{PropertyName} is Empty");
            }
        }

        protected override IValidator GetValidator()
        {
            return new CustomerValidator();
        }

    }

This is my base class:

    class MyClassBase
    {
        public MyClassBase()
        {
            _Validator = GetValidator();
            Validate();
        }

        protected IValidator _Validator = null;

        protected IEnumerable<ValidationFailure> _ValidationErrors = null;

        protected virtual IValidator GetValidator()
        {
            return null;
        }
        public IEnumerable<ValidationFailure> ValidationErrors
        {
            get { return _ValidationErrors; }
            set { }
        }

        public void Validate()
        {
            if (_Validator != null)
            {
                var context = new ValidationContext<Object>(_Validator);
                var results = _Validator.Validate(context); **// <======= Exception is here in this line**
                _ValidationErrors = results.Errors;
            }
        }

        public virtual bool IsValid
        {
            get
            {
                if (_ValidationErrors != null && _ValidationErrors.Count() > 0)
                    return false;
                else
                    return true;
            }
        }

    }

When I run the application test I get the below exception:

System.InvalidOperationException HResult=0x80131509 Message=Cannot validate instances of type 'CustomerValidator'. This validator can only validate instances of type 'Customer'. Source=FluentValidation StackTrace: at FluentValidation.ValidationContext1.GetFromNonGenericContext(IValidationContext context) in C:\Projects\FluentValidation\src\FluentValidation\IValidationContext.cs:line 211 at FluentValidation.AbstractValidator1.FluentValidation.IValidator.Validate(IValidationContext context)

Please, what is the issue here and How can I fix it?

Thank you

Your overall implementation isn't what I'd consider normal usage however the problem is that you're asking FV to validate the validator instance, rather than the customer instance:

var context = new ValidationContext<Object>(_Validator);
var results = _Validator.Validate(context);

It should start working if you change it to:

var context = new ValidationContext<object>(this);
var results = _Validator.Validate(context);

You're stuck with using the object argument for the validation context unless you introduce a generic argument to the base class, or create it using reflection.