In cart/checkout page, in payment methods I see grey progress bar all time, doesnt show order total preview information

I solved it:
Here is how I did:

It was originated by Vat module (http://drupal.org/project/uc_vat).
The error is when I have not included my type of product (classe) for applying taxes on it.
I included my type of product in page:
admin/store/settings/taxes/overview
and click edit in your taxe, then check your product type in taxed product types.