The API request quota for this developer account has been exceeded for the current time period (e.g. day). Try again later. (Since: 0.16.0.)
The user attempted to do something which required authentication, and they weren't authenticated or didn't have authorization for the operation
A given query parameter was invalid for the query type
There was a conflict when updating an entry on the server; the server-side copy was modified between downloading and uploading the modified entry
An entry has already been inserted, and cannot be re-inserted
Generic error for a forbidden action (not due to having insufficient permissions)
The service is unavailable due to local network errors (e.g. no Internet connection)
A requested resource (feed or entry) was not found on the server
The client or server unexpectedly strayed from the protocol (fatal error)
The service is unavailable due to proxy network errors (e.g. proxy unreachable)
The service is unavailable due to maintenance or other reasons (e.g. network errors at the server end)
Generic error when running a batch operation and the whole operation fails
Error codes for #GDataService operations.