duplicity mega backend error

[~/data/backups/nas] # /opt/bin/duplicity -v9 --encrypt-key=xxx --sign-key=xxx --use-agent --allow-source-mismatch --tempdir=/share/MD0_DATA/.duplicity/temp testfile.txt mega://xxx@mega.co.nz/test
Using archive dir: /root/.cache/duplicity/eacd2a039ee6d79536b71169a8d9b527
Using backup name: eacd2a039ee6d79536b71169a8d9b527
Import of duplicity.backends.botobackend Succeeded
Import of duplicity.backends.cfbackend Succeeded
Import of duplicity.backends.dpbxbackend Succeeded
Import of duplicity.backends.ftpbackend Succeeded
Import of duplicity.backends.ftpsbackend Succeeded
Import of duplicity.backends.gdocsbackend Succeeded
Import of duplicity.backends.hsibackend Succeeded
Import of duplicity.backends.imapbackend Succeeded
Import of duplicity.backends.localbackend Succeeded
Import of duplicity.backends.megabackend Succeeded
Import of duplicity.backends.rsyncbackend Succeeded
Import of duplicity.backends.sshbackend Succeeded
Import of duplicity.backends.swiftbackend Succeeded
Import of duplicity.backends.tahoebackend Succeeded
Import of duplicity.backends.u1backend Succeeded
Import of duplicity.backends.webdavbackend Succeeded
Import of duplicity.backends.~par2wrapperbackend Succeeded
Main action: inc
================================================================================
duplicity 0.6.24 (May 09, 2014)
Args: /opt/bin/duplicity -v9 --encrypt-key=xxx --sign-key=xxx --use-agent --allow-source-mismatch --tempdir=/share/MD0_DATA/.duplicity/temp testfile.txt mega://xxx@mega.co.nz/test
Linux NASC5ED37 2.6.33.2 #1 Sat Apr 12 06:34:32 CST 2014 armv5tel
/opt/bin/python2.6 2.6.8 (unknown, Apr 12 2012, 13:02:25)
[GCC 4.2.3]
================================================================================
Using temporary directory /share/MD0_DATA/.duplicity/temp/duplicity-gAcqI4-tempdir
Registering (mkstemp) temporary file /share/MD0_DATA/.duplicity/temp/duplicity-gAcqI4-tempdir/mkstemp-2cZ_gy-1
Temp has 2025218387968 available, backup will use approx 34078720.
Attempt 1 failed: AttributeError: 'Mega' object has no attribute 'get_name_from_file'
Backtrace of previous error: Traceback (innermost last):
  File "/opt/lib/python2.6/site-packages/duplicity/backend.py", line 318, in iterate
    return fn(*args, **kwargs)
  File "/opt/lib/python2.6/site-packages/duplicity/backends/megabackend.py", line 115, in _list
    % (self.__get_node_name(self.folder), str(e)), raise_errors)
  File "/opt/lib/python2.6/site-packages/duplicity/backends/megabackend.py", line 139, in __get_node_name
    return self.client.get_name_from_file({handle:files[handle]})
 AttributeError: 'Mega' object has no attribute 'get_name_from_file'

Attempt 2 failed: AttributeError: 'Mega' object has no attribute 'get_name_from_file'
Backtrace of previous error: Traceback (innermost last):
  File "/opt/lib/python2.6/site-packages/duplicity/backend.py", line 318, in iterate
    return fn(*args, **kwargs)
  File "/opt/lib/python2.6/site-packages/duplicity/backends/megabackend.py", line 115, in _list
    % (self.__get_node_name(self.folder), str(e)), raise_errors)
  File "/opt/lib/python2.6/site-packages/duplicity/backends/megabackend.py", line 139, in __get_node_name
    return self.client.get_name_from_file({handle:files[handle]})
 AttributeError: 'Mega' object has no attribute 'get_name_from_file'

Attempt 3 failed: AttributeError: 'Mega' object has no attribute 'get_name_from_file'
Backtrace of previous error: Traceback (innermost last):
  File "/opt/lib/python2.6/site-packages/duplicity/backend.py", line 318, in iterate
    return fn(*args, **kwargs)
  File "/opt/lib/python2.6/site-packages/duplicity/backends/megabackend.py", line 115, in _list
    % (self.__get_node_name(self.folder), str(e)), raise_errors)
  File "/opt/lib/python2.6/site-packages/duplicity/backends/megabackend.py", line 139, in __get_node_name
    return self.client.get_name_from_file({handle:files[handle]})
 AttributeError: 'Mega' object has no attribute 'get_name_from_file'

Attempt 4 failed: AttributeError: 'Mega' object has no attribute 'get_name_from_file'
Backtrace of previous error: Traceback (innermost last):
  File "/opt/lib/python2.6/site-packages/duplicity/backend.py", line 318, in iterate
    return fn(*args, **kwargs)
  File "/opt/lib/python2.6/site-packages/duplicity/backends/megabackend.py", line 115, in _list
    % (self.__get_node_name(self.folder), str(e)), raise_errors)
  File "/opt/lib/python2.6/site-packages/duplicity/backends/megabackend.py", line 139, in __get_node_name
    return self.client.get_name_from_file({handle:files[handle]})
 AttributeError: 'Mega' object has no attribute 'get_name_from_file'

Releasing lockfile <LinkLockFile: '/root/.cache/duplicity/eacd2a039ee6d79536b71169a8d9b527/NASC5ED37-4001ec00.25778' -- '/root/.cache/duplicity/eacd2a039ee6d79536b71169a8d9b527/lockfile'>
Removing still remembered temporary file /share/MD0_DATA/.duplicity/temp/duplicity-gAcqI4-tempdir/mkstemp-2cZ_gy-1
Traceback (most recent call last):
  File "/opt/bin/duplicity", line 1502, in <module>
    with_tempdir(main)
  File "/opt/bin/duplicity", line 1496, in with_tempdir
    fn()
  File "/opt/bin/duplicity", line 1345, in main
    do_backup(action)
  File "/opt/bin/duplicity", line 1374, in do_backup
    sync_archive(decrypt)
  File "/opt/bin/duplicity", line 1104, in sync_archive
    remlist = globals.backend.list()
  File "/opt/lib/python2.6/site-packages/duplicity/backend.py", line 429, in list
    return map(tobytes, self._list())
  File "/opt/lib/python2.6/site-packages/duplicity/backend.py", line 330, in iterate
    return fn(*args, **kwargs)
  File "/opt/lib/python2.6/site-packages/duplicity/backends/megabackend.py", line 115, in _list
    % (self.__get_node_name(self.folder), str(e)), raise_errors)
  File "/opt/lib/python2.6/site-packages/duplicity/backends/megabackend.py", line 139, in __get_node_name
    return self.client.get_name_from_file({handle:files[handle]})
AttributeError: 'Mega' object has no attribute 'get_name_from_file'