Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 475, in _inline_callbacks
    result = gen.send(result)
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 310, in install
    pkgname = app.pkgname
AttributeError: 'str' object has no attribute 'pkgname'