Image uploads or deletes not working anymore [bug]

[Yerlix]

The image uploads where working until today. Only the simpel image uploader will upload the images.
But deleting the uploaded images is also broken.

After some digging, I found out that the ajax response was "0".

// Delete file via Ajax
    $( '.rwmb-uploaded' ).on( 'click', '.rwmb-delete-file', function()
    {
        var $this = $( this ),
            $parent = $this.parents( 'li' ),
            $container = $this.closest( '.rwmb-uploaded' ),
            data = {
                action: 'rwmb_delete_file',
                _ajax_nonce: $container.data( 'delete_nonce' ),
                post_id: $( '#post_ID' ).val(),
                field_id: $container.data( 'field_id' ),
                attachment_id: $this.data( 'attachment_id' ),
                force_delete: $container.data( 'force_delete' )
            };

        $.post( ajaxurl, data, function( r )
        {
            console.log(ajaxurl);
            console.log(data);
            console.log(r);
            if ( !r.success )
            {
                alert( r.data );
                return;
            }

The console.log(r) gives back a 0. The other variables are filled in with the good object I think.

Can someone help me out with this?

[Yerlix]

I did a clean install and it worked again