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google.appengine.api.datastore_errors.BadValueError: Property identifier is not multi-line

Error:
google.appengine.api.datastore_errors.BadValueError: Property identifier is not multi-line

Reason:
http://code.google.com/appengine/docs/python/datastore/typesandpropertyclasses.html#StringProperty

class StringProperty(verbose_name=None, multiline=False, ...)

    A short string property. Takes a Python str or unicode (basestring) value of 500 bytes or less.

    StringProperty property values are indexed, and can be used in filters and sort orders.

    If multiline is False, then the value cannot include linefeed characters. The djangoforms library uses this to enforce a difference between text fields and textarea fields in the data model, and others can use it for a similar purpose.

    Value type: str or unicode