Is your default module a standard environment? The new flex environment doesn't support a variety of things such as the user service, perhaps from as well.
I had issues trying to route /_ah/* URLs to my standard environment service when the default frontend service was the new flex environment. For me, the work around was to make the standard environment default service, and specifically route web traffic to the (now non-default) frontend flex environment. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/49bfa60b-7b47-49ea-8a48-ae06900c2437%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
