Django Model Error

==Model Class ==
class ContentProvider(Document):
    Name = StringField('Name',required = True)
    Score = FloatField('Score')

==Django shell ==
>>>cp=ContentProvider(Name="ABC videos")
>>>cp.save()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/local/lib/python2.6/dist-packages/mongoengine-0.4-py2.6.egg/mongoengine/document.py", line 73, in save
    self.validate()
  File "/usr/local/lib/python2.6/dist-packages/mongoengine-0.4-py2.6.egg/mongoengine/base.py", line 357, in validate
    field._validate(value)
  File "/usr/local/lib/python2.6/dist-packages/mongoengine-0.4-py2.6.egg/mongoengine/base.py", line 103, in _validate
    self.validate(value)
  File "/usr/local/lib/python2.6/dist-packages/mongoengine-0.4-py2.6.egg/mongoengine/fields.py", line 51, in validate
    raise ValidationError(message)
ValidationError: String value did not match validation regex

>>>cp=ContentProvider(Name="ABC videos",Score=1200.0)
>>>cp.save()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/local/lib/python2.6/dist-packages/mongoengine-0.4-py2.6.egg/mongoengine/document.py", line 73, in save
    self.validate()
  File "/usr/local/lib/python2.6/dist-packages/mongoengine-0.4-py2.6.egg/mongoengine/base.py", line 357, in validate
    field._validate(value)
  File "/usr/local/lib/python2.6/dist-packages/mongoengine-0.4-py2.6.egg/mongoengine/base.py", line 103, in _validate
    self.validate(value)
  File "/usr/local/lib/python2.6/dist-packages/mongoengine-0.4-py2.6.egg/mongoengine/fields.py", line 171, in validate
    raise ValidationError('Float value is too small')
ValidationError: Float value is too small