You are trying to synchronise user profile service and nothing gets imported. There could be several reason(s). I had following issues.
- Replicating Domain Change permission not given for the user who is running USP.
- You have selected Group from the container, instead of OU. See below image. Only OU is supported not groups.
It is always a good idea to take help from the Active Directory folk, if you come across issues while syncing USP.