Hi,
After I migrated my website from magento 1.6 to 1.9, everything seems to be working fine except I am unable to generate invoices for orders.
after payment, the order status goes to processing. After that, when I go to invoice and click 'Submit Invoice' to make the invoice, I get error message saying 'Unable to save the invoice'. I need you to fix it so that everything works fine.
Urgent project. Need help.