I get this intermittently, and today I can't seem to update my backends at all. Here is the exception, any help is greatly appreciated:
Unable to update:
500 Internal Server Error
Server Error (500)
A server error has occurred.
at com.google.appengine.tools.admin.AbstractServerConnection.send1(AbstractServerConnection.java:285)
at com.google.appengine.tools.admin.AbstractServerConnection.send(AbstractServerConnection.java:245)
at com.google.appengine.tools.admin.AppVersionUpload.send(AppVersionUpload.java:606)
at com.google.appengine.tools.admin.AppVersionUpload.startServing(AppVersionUpload.java:587)
at com.google.appengine.tools.admin.AppVersionUpload.commit(AppVersionUpload.java:532)
at com.google.appengine.tools.admin.AppVersionUpload.doUpload(AppVersionUpload.java:141)
at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:328)
at com.google.appengine.tools.admin.AppAdminImpl.updateAllBackends(AppAdminImpl.java:74)
at com.google.appengine.tools.admin.AppCfg$BackendsUpdateAction.execute(AppCfg.java:1095)
at com.google.appengine.tools.admin.AppCfg$BackendsAction.execute(AppCfg.java:1259)
at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:172)
at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:69)
at com.google.appengine.tools.admin.AppCfg.main(AppCfg.java:65)
at net.kindleit.gae.EngineGoalBase$1.run(EngineGoalBase.java:318)