I am using solidwork 2016 education edition SP4.0.  Whenever, I use the pack and go I get the following error message. "The SOLIDWORKS Document Mananger library is invalid.  Please see your administrator". 

Hi Sean,
Pack and go uses "Document manager api" for its work. Seems that document manager files were corrupted on your computer.
Try to reinstall pack and go module (via SW repair). This will replace corrupted DLLs.
You can also choose to reinstall "Edrawings" module. This should also trigger replacement of corrupted DLLs.