I got the same problem since today. Changing the version number did
not change anything. Maybe a Google server problem?
someone had this problem in 2009. So this is possibly not a new
problem...
http://www.mail-archive.com/google-appengine-java@googlegroups.com/msg03589.html
On 17 Dez., 09:02,
we are continually working on improving the overall reliability, but
on some occasions, the system will experience higher than normal
latencies within the underlying infrastructure, which may manifest
itself to users in the form of upload issues, timeouts
(DeadlineExceeded), or other server 500
