HelloI have a problem, i upgraded magento from 1.6 to 22.214.171.124everything seem function good, but in the back end i cant open the sales and i see a white screen.The error log
[Thu Jul 23 16:04:02 2015] [error] [client xxxxxxx PHP Fatal error: Undefined class constant 'ACTION_FLAG_PRODUCTS_PERMISSION_DENIED' in /XXXXXXXXXXXXXXX/public_html/app/code/core/Mage/Adminhtml/controllers/Sales/OrderController.php on line 119, referer: http://rxxxxxxxxx.nl/index.php/magepanel/sales_order/index/key/bc0f219bb28ce9b485f2079546db28a0/
I searcht the internet but i cant find the problem
Look in app/code/local/Mage and see if Sales is there. If is there, change the name for the folder Sales_old and test again in admin. If is working, there is the problem in local Sales folder.