Magento GoogleCheckout Error after upgrade

Magento Googlecheckout error after upgrading Magento

• Warning: include(/home/*/public_html/includes/src/Mage_Googlecheckout_Helper_Data.php): failed to open stream: No such file or directory in /home/*/public_html/includes/src/Varien_Autoload.php on line 93
  (with compilation enabled)
  
• Warning: include(Mage/Googlecheckout/Helper/Data.php): failed to open stream: No such file or directory in /home/*/public_html/lib/Varien/Autoload.php on line 93
  (With compilation disabled)
  

Solution

• Delete all files except config.xml from the following directory: app/code/core/Mage/GoogleCheckout/etc/
  • app/code/core/Mage/GoogleCheckout/etc/adminhtml.xml
  • app/code/core/Mage/GoogleCheckout/etc/system.xml
  • app/code/core/Mage/GoogleCheckout/etc/wsdl.xml
  • app/code/core/Mage/GoogleCheckout/etc/wsi.xml
• Delete all of:
  • var/cache/*
  • var/session/*
  • var/locks/*
  • var/full_page_cache/*
  • tmp/*
  • downloader/pearlib/cache/*
  • downloader/pearlib/download/*

References

http://duntuk.com/magento-upgrade
http://magento.stackexchange.com/questions/14773/magento-1-8-1-0-google-checkout-missing-comparing-to-1-8-0-0