Finalizar pago

Fatal error: Uncaught Error: Call to a member function pagina_recibo() on string in /var/www/vhosts/vagospermanentes.com/httpdocs/templates/bootstrap4/extensions/ext_shop/cesta_pago_form.php:8 Stack trace: #0 /var/www/vhosts/vagospermanentes.com/httpdocs/includes/class/controller.class.php(1889): require_once() #1 /var/www/vhosts/vagospermanentes.com/httpdocs/includes/class/controller.class.php(1474): Controller->ruteaEspecial('cesta_pago_form', 0) #2 /var/www/vhosts/vagospermanentes.com/httpdocs/includes/class/controller.class.php(874): Controller->rutea('cesta_pago_form', 0) #3 /var/www/vhosts/vagospermanentes.com/httpdocs/extensions/ext_shop/shop.php(6): Controller->display(0) #4 /var/www/vhosts/vagospermanentes.com/httpdocs/includes/class/helpers/extensionHelper.class.php(202): require('/var/www/vhosts...') #5 /var/www/vhosts/vagospermanentes.com/httpdocs/includes/class/app.class.php(1038): ExtensionHelper::renderExtension('ext_shop', Array) #6 /var/www/vhosts/vagospermanentes.com/httpdocs/index.php(40): App->dispatch in /var/www/vhosts/vagospermanentes.com/httpdocs/templates/bootstrap4/extensions/ext_shop/cesta_pago_form.php on line 8