Android Studio - Inflate PopupMenu with custom layout?

I try to inflate the popupmenu with a custom layout, I do not want to load it from the resources "menu". I have the following code:

imageButtonMasOpciones.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {


            //Creating the instance of PopupMenu
            PopupMenu popup = new PopupMenu(getContext(), imageButtonMasOpciones);

            //Inflating the Popup using xml file
            popup.getMenuInflater().inflate(R.menu.popup_menu, popup.getMenu());

            //registering popup with OnMenuItemClickListener
            popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                @Override
                public boolean onMenuItemClick(MenuItem menuItem) {
                    Toast.makeText(getContext(),"Item : " + menuItem.getTitle(),Toast.LENGTH_SHORT).show();
                    return true;
                }
            });
            popup.show();
        }
    });

In that code the popupMenu is created well, but when I replace this line of code:

popup.getMenuInflater().inflate(R.menu.popup_menu, popup.getMenu());

for this:

popup.getMenuInflater().inflate(R.layout.popup, popup.getMenu());

the application closes