Laravel 5 MethodNotAllowedHttpException after validation fails (going back to POST)

I shall try to be as explicit as possible…I am quite new in Laravel…

Process:

1) I have a view with form where a customer should enter a promo; I have a PromoRequest to validate this promo code ;

2) I have a view with a form where, if the promo code passed the rules, the customer should fill in his data; I have a CustRequest to validate his date (p.e. ‘email’ => ‘required’ etc)

3) And finally I have a confirmation view to show the customer data with a validation button; if find, I store the data in a DB, and send an email

Issue:

1) The first step works fine

2) In the second view, if my validation rule fails (p.e. no email), I got a MethodNotAllowedHttpException I understand that if the inscription validation fails (no email), it goes back to my inscription form which is a POST method…and that brings the problem…

How can I sort that out???

Thanks

via Chebli Mohamed