Cluster relation changed hook test error

2017-09-02 12:51:02 INFO juju-log cluster:2: Starting apache
2017-09-02 12:51:02 INFO cluster-relation-changed Site archive_ubuntu_com already enabled
2017-09-02 12:51:02 INFO cluster-relation-changed active
2017-09-02 12:51:02 INFO juju-log cluster:2: Cleaning metadata directory
2017-09-02 12:51:02 INFO juju-log cluster:2: Removing tree /srv/ubuntu-repository-cache/apache/data/ubuntu_2017-09-02_12:49:01_u0
2017-09-02 12:51:03 INFO cluster-relation-changed Traceback (most recent call last):
2017-09-02 12:51:03 INFO cluster-relation-changed File "/var/lib/juju/agents/unit-ubuntu-repository-cache-0/charm/hooks/cluster-relation-changed", line 245, in <module>
2017-09-02 12:51:03 INFO cluster-relation-changed HOOKS.execute(sys.argv)
2017-09-02 12:51:03 INFO cluster-relation-changed File "/var/lib/juju/agents/unit-ubuntu-repository-cache-0/charm/lib/charmhelpers/core/hookenv.py", line 715, in execute
2017-09-02 12:51:03 INFO cluster-relation-changed self._hooks[hook_name]()
2017-09-02 12:51:03 INFO cluster-relation-changed File "/var/lib/juju/agents/unit-ubuntu-repository-cache-0/charm/hooks/cluster-relation-changed", line 186, in cluster_relation_changed
2017-09-02 12:51:03 INFO cluster-relation-changed mirror.peer_update_metadata()
2017-09-02 12:51:03 INFO cluster-relation-changed File "/var/lib/juju/agents/unit-ubuntu-repository-cache-0/charm/lib/ubuntu_repository_cache/mirror.py", line 301, in peer_update_metadata
2017-09-02 12:51:03 INFO cluster-relation-changed _leader_update_metadata()
2017-09-02 12:51:03 INFO cluster-relation-changed File "/var/lib/juju/agents/unit-ubuntu-repository-cache-0/charm/lib/ubuntu_repository_cache/mirror.py", line 181, in _leader_update_metadata
2017-09-02 12:51:03 INFO cluster-relation-changed metadata_sync.clean_metadata_dir(apache_root, LOG)
2017-09-02 12:51:03 INFO cluster-relation-changed File "/var/lib/juju/agents/unit-ubuntu-repository-cache-0/charm/lib/ubuntu_repository_cache/metadata_sync.py", line 362, in clean_metadata_dir
2017-09-02 12:51:03 INFO cluster-relation-changed shutil.rmtree(entry)
2017-09-02 12:51:03 INFO cluster-relation-changed File "/usr/lib/python3.5/shutil.py", line 474, in rmtree
2017-09-02 12:51:03 INFO cluster-relation-changed _rmtree_safe_fd(fd, path, onerror)
2017-09-02 12:51:03 INFO cluster-relation-changed File "/usr/lib/python3.5/shutil.py", line 416, in _rmtree_safe_fd
2017-09-02 12:51:03 INFO cluster-relation-changed onerror(os.rmdir, fullname, sys.exc_info())
2017-09-02 12:51:03 INFO cluster-relation-changed File "/usr/lib/python3.5/shutil.py", line 414, in _rmtree_safe_fd
2017-09-02 12:51:03 INFO cluster-relation-changed os.rmdir(name, dir_fd=topfd)
2017-09-02 12:51:03 INFO cluster-relation-changed OSError: [Errno 39] Directory not empty: 'dists'
2017-09-02 12:51:03 ERROR juju.worker.uniter.operation runhook.go:107 hook "cluster-relation-changed" failed: exit status 1

2017-09-02 13:21:46 [ERROR] Error in juju status on ubuntu-repository-cache/0