What does "Temporary Error (502)" mean?
311 views | 0 0 | Last updated on Feb 23, 2016 Error Messages
This error is associated with a common error in Google Drive and could mean that your documents are temporarily unavailable. Generally, this error will resolve itself within a couple of minutes.
If Google Drive loads but you are unable to view your files, try clicking on another view, such as "all items" or "owned by me", doing this should make the error disappear.