Unable to update to latest duplicity through apt-get

[Gaurav Ashtikar]

Duplicity Version: 0.7.0-0ubuntu0ppa1012~ubuntu12.04.1
Python version: Python 2.7.3 (default, Feb 27 2014, 19:58:35)
OS: Ubuntu 12.04.5 LTS

Hi,
I was updating packages, thorugh apt-get upgrade, duplicity given me following error:

Setting up duplicity (0.7.0-0ubuntu0ppa1012~ubuntu12.04.1) ...
SyntaxError: ('invalid syntax', ('/usr/lib/python2.7/dist-packages/duplicity/backends/gdocsbackend.py', 51, 197, " self.client = gdata.docs.client.DocsClient(source='duplicity Usage: dpkg Options: parser options: output formats, defaults to 'dpkg' for compatibility with dpkg than version <number> is lower than 0) ')\n"))

dpkg: error processing duplicity (--configure):
 subprocess installed post-installation script returned error exit status 101
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
Errors were encountered while processing:
 duplicity
E: Sub-process /usr/bin/dpkg returned an error code (1)