djvubind produces "OSError: [Errno 2] No such file or directory"

[Zev-Chonoles]

Everything about capturing and postprocessing seems to be working for me now, but I've run into a consistent problem with djvu output. The plugins that were turned on in this run-through were autorotate, djvubind (the apparent source of the problem), gui, scantailor, and tesseract.

My main concern is the error that breaks the process, but also I noticed that even though tesseract was turned on, it seems djvubind was passed an option --no-ocr, which I assume means that if djvubind had worked, the OCR data wouldn't have been used. (If it's not a trivial fix, I can open a separate issue.)

I'm on Ubuntu 14.04 64-bit, running two Canon A2500 cameras with CHDK version a2500-100a-1.3.0-4132-full_ALPHA on them.

zev@zev-X58A-UD7:~$ spread --verbose wizard spread-test
==========================
 Starting capturing process
 ==========================
Workflow: Initializing workflow spread-test
bagit: Adding path /home/zev/spread-test/bag-info.txt to payload
bagit: Adding path /home/zev/spread-test/bag-info.txt to payload
bagit: Adding path /home/zev/spread-test/bag-info.txt to payload
bagit: Adding path /home/zev/spread-test/bag-info.txt to payload
bagit: Adding path /home/zev/spread-test/bag-info.txt to payload
bagit: Adding path /home/zev/spread-test/bag-info.txt to payload
bagit: Adding path spread-test/config.yml to payload
spreads.plugin: Finding devices for driver "CHDKCameraDevice"
Found 2 devices!
Setting up devices for capturing.
Workflow: Preparing capture.
Workflow: Preparing capture in devices
CHDKCameraDevice[7B4C]: Setting focus to mode 'autofocus_all'
CHDKCameraDevice[A28E]: Setting focus to mode 'autofocus_all'
Workflow: Running 'prepare_capture' hooks
Workflow: Running 'start_trigger_loop' hooks
( /b) capture | (r) retake last shot | (f) finish
Workflow: Triggering capture.
Workflow: Sending capture command to devices
chdkptp.lua: rc chunk get 1 0
chdkptp.lua: rc chunk size:1461760 offset:17920 last:false
chdkptp.lua: rc chunk get 1 1
chdkptp.lua: rc chunk get 1 0
chdkptp.lua: rc chunk size:1479168 offset:nil last:false
chdkptp.lua: rc chunk get 1 2
chdkptp.lua: rc chunk size:1018817 offset:nil last:false
chdkptp.lua: rc chunk get 1 3
chdkptp.lua: rc chunk size:1461760 offset:17920 last:false
chdkptp.lua: rc chunk get 1 1
chdkptp.lua: rc chunk size:17920 offset:0 last:true
chdkptp.lua: rc chunk size:1479168 offset:nil last:false
chdkptp.lua: rc chunk get 1 2
chdkptp.lua: rc chunk size:929380 offset:nil last:false
chdkptp.lua: rc chunk get 1 3
chdkptp.lua: rc chunk size:17920 offset:0 last:true
CHDKCameraDevice[A28E]: Setting EXIF orientation on captured image
CHDKCameraDevice[7B4C]: Setting EXIF orientation on captured image
Workflow: Running 'capture' hooks
bagit: Adding path spread-test/data/raw/001.jpg to payload
bagit: Adding path spread-test/data/raw/000.jpg to payload
bagit: Adding path spread-test/pagemeta.json to payload
Shot   2 pages [702302/h] bagit: Adding path /home/zev/spread-test/bag-info.txt to payload
Workflow: Triggering capture.
Workflow: Sending capture command to devices
chdkptp.lua: rc chunk get 1 0
chdkptp.lua: rc chunk size:1461760 offset:17920 last:false
chdkptp.lua: rc chunk get 1 1
chdkptp.lua: rc chunk get 1 0
chdkptp.lua: rc chunk size:1461760 offset:17920 last:false
chdkptp.lua: rc chunk get 1 1
chdkptp.lua: rc chunk size:1479168 offset:nil last:false
chdkptp.lua: rc chunk get 1 2
chdkptp.lua: rc chunk size:963033 offset:nil last:false
chdkptp.lua: rc chunk get 1 3
chdkptp.lua: rc chunk size:1479168 offset:nil last:false
chdkptp.lua: rc chunk get 1 2
chdkptp.lua: rc chunk size:797185 offset:nil last:false
chdkptp.lua: rc chunk get 1 3
chdkptp.lua: rc chunk size:17920 offset:0 last:true
chdkptp.lua: rc chunk size:17920 offset:0 last:true
CHDKCameraDevice[A28E]: Setting EXIF orientation on captured image
CHDKCameraDevice[7B4C]: Setting EXIF orientation on captured image
Workflow: Running 'capture' hooks
bagit: Adding path spread-test/data/raw/003.jpg to payload
bagit: Adding path spread-test/data/raw/002.jpg to payload
bagit: Adding path spread-test/pagemeta.json to payload
Shot   4 pages [1310/h] bagit: Adding path /home/zev/spread-test/bag-info.txt to payload
Workflow: Sending finish_capture command to devices
bagit: Adding path spread-test/pagemeta.json to payload
Workflow: Running 'finish_capture' hooks
Workflow: Running 'stop_trigger_loop' hooks
=======================
Starting postprocessing
=======================
Workflow: Initializing workflow spread-test
bagit: Adding path /home/zev/spread-test/bag-info.txt to payload
bagit: Adding path spread-test/config.yml to payload
Workflow: Starting postprocessing...%
Workflow: Running 'process' hooks
spreadsplug.autorotate: Rotating images
spreadsplug.scantailor: Generating ScanTailor configuration
spreadsplug.scantailor: /usr/bin/scantailor-cli --start-filter=1 --end-filter=3 --layout=1.5 -o=/tmp/tmpl21k5Y.ScanTailor --margins-top=2.5 --margins-right=2.5 --margins-bottom=2.5 --margins-left=2.5 spread-test/data/done/000_rotated.jpg spread-test/data/done/001_rotated.jpg spread-test/data/done/002_rotated.jpg spread-test/data/done/003_rotated.jpg /tmp/st-outp65f8I
spreadsplug.scantailor: If you are changing output settings (in the last step, you *have* to run the last step from the GUI. Due to a bug in ScanTailor, your settings would otherwise be ignored.
spreadsplug.scantailor: Opening ScanTailor GUI for manual adjustment
spreadsplug.scantailor: Generating output images from ScanTailor configuration.
spreadsplug.scantailor: Generating output...
spreadsplug.scantailor: Launching those subprocesses!
spreadsplug.tesseract: Performing OCR%
spreadsplug.tesseract: Language is "equ"
spreadsplug.tesseract: [u'/usr/bin/tesseract', u'spread-test/data/done/002_rotated.tif', u'/tmp/tess-outGj6kE1/002_rotated', u'-l', u'equ', u'hocr']
spreadsplug.tesseract: [u'/usr/bin/tesseract', u'spread-test/data/done/003_rotated.tif', u'/tmp/tess-outGj6kE1/003_rotated', u'-l', u'equ', u'hocr']
spreadsplug.tesseract: [u'/usr/bin/tesseract', u'spread-test/data/done/000_rotated.tif', u'/tmp/tess-outGj6kE1/000_rotated', u'-l', u'equ', u'hocr']
spreadsplug.tesseract: [u'/usr/bin/tesseract', u'spread-test/data/done/001_rotated.tif', u'/tmp/tess-outGj6kE1/001_rotated', u'-l', u'equ', u'hocr']
bagit: Adding path spread-test/data/done to payload
bagit: Adding path /home/zev/spread-test/bag-info.txt to payload
bagit: Adding path spread-test/pagemeta.json to payload
Workflow: Done with postprocessing!
=================
 Generating output
=================
Workflow: Initializing workflow spread-test
bagit: Adding path /home/zev/spread-test/bag-info.txt to payload
bagit: Adding path spread-test/config.yml to payload
Workflow: Generating output files...%
Workflow: Running 'output' hooks ] 0%
spreadsplug.djvubind: Assembling DJVU.
spreadsplug.djvubind: Running djvubind /tmp/tmpu9fUEc --no-ocr
spreads encountered an error:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/spreads/main.py", line 321, in main
    run()
  File "/usr/local/lib/python2.7/dist-packages/spreads/main.py", line 308, in run
    args.subcommand(config)
  File "/usr/local/lib/python2.7/dist-packages/spreads/cli.py", line 398, in wizard
    output(config)
  File "/usr/local/lib/python2.7/dist-packages/spreads/cli.py", line 376, in output
    workflow.output()
  File "/usr/local/lib/python2.7/dist-packages/spreads/workflow.py", line 985, in output
    self.table_of_contents)
  File "/usr/local/lib/python2.7/dist-packages/spreads/workflow.py", line 833, in _run_hook
    getattr(plug, hook_name)(*args)
  File "/usr/local/lib/python2.7/dist-packages/spreadsplug/djvubind.py", line 75, in output
    os.rename("book.djvu", unicode(djvu_file))
OSError: [Errno 2] No such file or directory