Window Modal does not work

@RRIOS,

In your javascript you have '#meuModal' instead of '#myModal'

I changed ... did not show the window.

Code:

<div class="modal fade" id="myModal">
     <div class="modal-dialog modal-lg modal-dialog-centered" role="document">
           <div class="modal-content">
               <div class="modal-header">
                   <h4 class="modal-title">My Modal</h4>
                   <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                       <span aria-hidden="true">×</span>
                   </button>
               </div>
               <div class="modal-body">
                   ...
               </div>
               <div class="modal-footer">
                   <button type="button" class="btn btn-secondary mx-auto" data-dismiss="modal">Close</button>
               </div>
           </div>
     </div>
</div>
<script>
$(document).ready(function(){
  $('#myModal').modal('show');
});
</script>