Version-Release number of selected component:
calibre-0.9.42-1.fc18

Additional info:
reporter:       libreport-2.1.6
cmdline:        python2 /usr/bin/calibre-parallel
executable:     /usr/bin/calibre-parallel
kernel:         3.10.10-100.fc18.x86_64
runlevel:       N 5
type:           Python
uid:            1000

Truncated backtrace:
plumber.py:786:find_html_index:ValueError: Impossibile trovare un ebook nell'archivio

Traceback (most recent call last):
  File "/usr/bin/calibre-parallel", line 20, in <module>
    sys.exit(main())
  File "/usr/lib64/calibre/calibre/utils/ipc/worker.py", line 188, in main
    result = func(*args, **kwargs)
  File "/usr/lib64/calibre/calibre/gui2/convert/gui_conversion.py", line 31, in gui_convert_override
    override_input_metadata=True)
  File "/usr/lib64/calibre/calibre/gui2/convert/gui_conversion.py", line 22, in gui_convert
    override_input_metadata=override_input_metadata)
  File "/usr/lib64/calibre/calibre/ebooks/conversion/plumber.py", line 694, in __init__
    self.input, input_fmt = self.unarchive(self.input, tdir)
  File "/usr/lib64/calibre/calibre/ebooks/conversion/plumber.py", line 775, in unarchive
    return self.find_html_index(files)
  File "/usr/lib64/calibre/calibre/ebooks/conversion/plumber.py", line 786, in find_html_index
    raise ValueError(_('Could not find an ebook inside the archive'))
ValueError: Impossibile trovare un ebook nell'archivio

Local variables in innermost frame:
files: [u'/tmp/calibre_0.9.42_tmp_VoChoz/0AQ1DH_pl_arc/Interview.mp3', u'/tmp/calibre_0.9.42_tmp_VoChoz/0AQ1DH_pl_arc/DNA_-_Activation.mp3', u'/tmp/calibre_0.9.42_tmp_VoChoz/0AQ1DH_pl_arc/pillola_base_best_moment_ingl.mp3', u'/tmp/calibre_0.9.42_tmp_VoChoz/0AQ1DH_pl_arc/pillola_abbondanza_best_moment_ingl.mp3', u'/tmp/calibre_0.9.42_tmp_VoChoz/0AQ1DH_pl_arc/SevenPlanes.mp3', u'/tmp/calibre_0.9.42_tmp_VoChoz/0AQ1DH_pl_arc/pillola_avanzato_best_moments_ing.mp3', u'/tmp/calibre_0.9.42_tmp_VoChoz/0AQ1DH_pl_arc/Rainbow_-_Children.mp3']
html_files: []
self: <class 'calibre.ebooks.conversion.plumber.Plumber'>
html_pat: <_sre.SRE_Pattern object at 0x37b15d0>
f: u'/tmp/calibre_0.9.42_tmp_VoChoz/0AQ1DH_pl_arc/Rainbow_-_Children.mp3'