If you are experiencing issues with any Google service it is best to have a look on Google’s status page. Here you will find information on the current status of Google services, please use the link below.
http://www.google.com/appsstatus#hl=en&v=status
As you can see in the below screenshot there is currently an issue with Google Drive.
When you click on the service it will give you further info on the status and usually a workaround, see below screenshot.
This issue with Google Drive is now resolved.
