I am working on odoo 9. I need to show popup. I am using that code to show popup

raise osv.except_osv(_('UserError!'), _("Invoice not completed yet. Please complete that invoice"))

and it shows that message

"WARNING odoo openerp.exceptions: except_orm is deprecated. Please use specific exceptions like UserError or AccessError", and popup never shows up. Please help me in that

Another thing, for example if i have invoice id 1, or any other invoice info. I want to show user an lnvoice link, when user click on that link user will be redirected to that invoice. Please help me in that