Internal Server Error Regarding ElementHelper.php.bak I am getting the following error on my local machine when updating Craft 2.6.


  /craft/app/helpers/ElementHelper.php.bak: failed to open stream: Permission denied


I don't even see that file in the directory.

Any ideas?
At what point of the update process are you getting that error?

During an auto-update, Craft creates a .bak of every file that it's about to update before doing the file swap.  The last step of the update process (the "Cleaning up..." stage), goes through and deletes all of the .bak files that were created.

I'd also make sure that the craft/app folder is recursively writable by PHP as that's required for auto-updating to work correctly.