mongoDB_error

Traceback (most recent call last):
  File "../hs.py", line 1, in <module>
    from hadoopstack.main import app
  File "/home/hellboy2k8/Documents/siel/HadoopStack/hadoopstack/main.py", line 9, in <module>
    mongo = PyMongo(app)
  File "/home/hellboy2k8/Documents/siel/HadoopStack/venv/local/lib/python2.7/site-packages/flask_pymongo/__init__.py", line 107, in __init__
    self.init_app(app, config_prefix)
  File "/home/hellboy2k8/Documents/siel/HadoopStack/venv/local/lib/python2.7/site-packages/flask_pymongo/__init__.py", line 221, in init_app
    db = cx[dbname]
  File "/home/hellboy2k8/Documents/siel/HadoopStack/venv/local/lib/python2.7/site-packages/pymongo/mongo_client.py", line 1101, in __getitem__
    return self.__getattr__(name)
  File "/home/hellboy2k8/Documents/siel/HadoopStack/venv/local/lib/python2.7/site-packages/flask_pymongo/wrappers.py", line 40, in __getattr__
    attr = super(MongoClient, self).__getattr__(name)
  File "/home/hellboy2k8/Documents/siel/HadoopStack/venv/local/lib/python2.7/site-packages/pymongo/mongo_client.py", line 1090, in __getattr__
    return database.Database(self, name)
  File "/home/hellboy2k8/Documents/siel/HadoopStack/venv/local/lib/python2.7/site-packages/pymongo/database.py", line 73, in __init__
    _check_name(name)
  File "/home/hellboy2k8/Documents/siel/HadoopStack/venv/local/lib/python2.7/site-packages/pymongo/database.py", line 39, in _check_name
    "character %r" % invalid_char)
pymongo.errors.InvalidName: database names cannot contain the character '.'