Exception in logger

[Roberto Alsina]

When running ubuntuone-syncdaemon from trunk with DEBUG=True on natty I get these exceptions repeatedly:

Traceback (most recent call last):
  File "/usr/lib/python2.7/logging/handlers.py", line 77, in emit
    if self.shouldRollover(record):
  File "/home/ralsina/canonical/ubuntuone/alecu/ubuntuone/logger.py", line 101, in shouldRollover
    msg = "%s\n" % self.format(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 719, in format
    return fmt.format(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 464, in format
    record.message = record.getMessage()
  File "/usr/lib/python2.7/logging/__init__.py", line 328, in getMessage
    msg = msg % self.args
TypeError: float argument required, not unicode
Logged from file sync.py, line 274