When I try to update my appengine project, it gives me an error.
$ sudo gcloud app deploy
ERROR: (gcloud.app.deploy) Staging command [/usr/local/google-cloud-sdk/platform/google_appengine/goroot-1.6/bin/go-app-stager /Users/baz/app/app.yaml /tmp/tmpSZLK/tmpIQ4] failed with return code [1].
------------------------------------ STDOUT ------------------------------------
------------------------------------ STDERR ------------------------------------
2017/07/08 16:22:06 failed analyzing /Users/baz/app: cannot find package "bitbucket.org/foo/bar" in any of:
($GOROOT not set)
($GOPATH not set)
GOPATH:
$ echo $GOPATH
/Users/baz/go
$ go env GOPATH
/Users/baz/go
Clearly GOPATH is set (I export it in my .bash_profile).