Ansible-error

gistfile1.txt

ansible -m ping -u ubuntu all
Traceback (most recent call last):
  File "/usr/local/Cellar/ansible/1.8.1/libexec/bin/ansible", line 194, in <module>
    (runner, results) = cli.run(options, args)
  File "/usr/local/Cellar/ansible/1.8.1/libexec/bin/ansible", line 112, in run
    inventory_manager = inventory.Inventory(options.inventory, vault_password=vault_pass)
  File "/usr/local/Cellar/ansible/1.8.1/libexec/lib/python2.7/site-packages/ansible/inventory/__init__.py", line 118, in __init__
    self.parser = InventoryScript(filename=host_list)
  File "/usr/local/Cellar/ansible/1.8.1/libexec/lib/python2.7/site-packages/ansible/inventory/script.py", line 49, in __init__
    self.groups = self._parse(stderr)
  File "/usr/local/Cellar/ansible/1.8.1/libexec/lib/python2.7/site-packages/ansible/inventory/script.py", line 57, in _parse
    self.raw  = utils.parse_json(self.data)
  File "/usr/local/Cellar/ansible/1.8.1/libexec/lib/python2.7/site-packages/ansible/utils/__init__.py", line 552, in parse_json
    results = json.loads(data)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/__init__.py", line 338, in loads
    return _default_decoder.decode(s)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 365, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 383, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded