Magento

Could someone please help me. After the upgrade i’m unable to view any invoices i get the following error

Fatal error: Call to a member function updateBackButtonUrl() on a non-object in /home/laura/domains/laurakinderkleding.nl/public_html/app/code/core/Mage/Adminhtml/controllers/Sales/Order/InvoiceController.php on line 148

i tried everything from a clean install to replacing all the files in that map but nothing seems to work

I’m willing to pay for the solution

Have you installed all extensions you had installed prior to upgrade? (especially payment processing extensions and related).

Same problem ... news?

It caused by unistall or remove payment extension. Possibel solution is install back removed payment extension and disable it for frontend.