I was having issues with the datastore so I decided to update my Appengine version to 1.4.2 from 1.4.0....
Had this error pop up, so I tried to uninstall appengine... also got this error. Deleted the app engine files myself and tried to run new installer. Still getting this error message, now I have no idea how I'm going to develop my app further. Can anybody assist me who has also had this issue? Thanks for your time and especially your patience -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.