Was adjusting some things and then got the error:
Warning: include (.../app/design/adminhtml/default/default/template/callouts/left_col.phtml) [function.include]: failed to open stream: No such file or directory in .../app/code/core/Mage/Core/Block/Template.php on line 144
when trying to access the admin page. Also, only my home page shows, and all other pages give this error.
I uploaded my saved backups of the files I was messing with, no help.
I browsed to the template folder to see that there isn’t a callouts folder, yet alone a left_col.phtml file.
I can’t see in the Templates.php file where left_col would be referenced, but I’m a complete php noob.
I downloaded the most recent version of magento to hunt for callouts/left_col.phtml and it’s not there.
I have no idea what I did, or what to do now to fix it!