Can not backup database for *


I tried to make a backup of mongodb for my app in

meteor login
meteor mongo <my_app> --url
mongodump -u <client-id> -p <password> -h <host:port> -d <app_directory>

But I got an error,

Failed: error counting <my_app>_meteor_com.system.users: not authorized on <my_app>_meteor_com to execute command { count: "system.users", query: {} }

How can I avoid this situation?

The version of mongodump was 3.2.
Changing to 2.6 solved my problem.