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Public bug reported:

When I try to open a djvu file in viewer I get this error

calibre, version 2.5.0
ERROR: Could not open ebook: unpack requires a string argument of length 4

Traceback (most recent call last):
  File "site-packages/calibre/gui2/viewer/main.py", line 37, in run
  File "threading.py", line 763, in run
  File "site-packages/calibre/ebooks/oeb/iterator/book.py", line 98, in __enter__
  File "site-packages/calibre/customize/conversion.py", line 241, in __call__
  File "site-packages/calibre/ebooks/conversion/plugins/djvu_input.py", line 27, in convert
  File "site-packages/calibre/ebooks/djvu/djvu.py", line 114, in __init__
  File "site-packages/calibre/ebooks/djvu/djvu.py", line 54, in __init__
  File "site-packages/calibre/ebooks/djvu/djvu.py", line 38, in __init__
error: unpack requires a string argument of length 4


I get the same error when I try to convert djvu file into any other format

** Affects: calibre (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1380639

Title:
  viewer can't open djvu file

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