'Could not find any usable backends.' ---- only -h works

[karolzlot]

Any clue?

build installed via readme method:

pi@raspberrypi:~/Desktop/muza $ rganalysis -h
usage: rganalysis [-h] [-f] [-i] [-n] [-g (track|album|auto)]
                  [-b (audiotools|bs1770gain|auto)] [-j 4] [-m] [-q] [-v]
                  [music_dir [music_dir ...]]

Add replaygain tags to your music files.

positional arguments:
  music_dir             Directories in which to search for music files.

optional arguments:
  -h, --help            show this help message and exit
  -f, --force-reanalyze
                        Reanalyze all files and recalculate replaygain values,
                        even if the files already have valid replaygain tags.
                        Normally, only files missing or inconsistent
                        replaygain tags will be analyzed.
  -i, --include-hidden  Do not skip hidden files and directories.
  -n, --dry-run         Don't modify any files. Only analyze and report gain.
  -g (track|album|auto), --gain-type (track|album|auto)
                        Can be "album", "track", or "auto". If "track", only
                        track gain values will be calculated, and album gain
                        values will be erased. if "album", both track and
                        album gain values will be calculated. If "auto", then
                        "album" mode will be used except in directories that
                        contain a file called "TRACKGAIN" or ".TRACKGAIN". In
                        these directories, "track" mode will be used. The
                        default setting is "auto".
  -b (audiotools|bs1770gain|auto), --backend (audiotools|bs1770gain|auto)
                        Gain computing backend to use. Different backends have
                        different prerequisites.
  -j 4, --jobs 4        Number of albums to analyze in parallel. The default
                        is the number of cores detected on your system.
  -m, --low-memory      Use less memory by processing directories one by one
                        rather than pre-computing the complete list of files
                        to be processed. This will disable progress bars, but
                        will allow rganalysis to run on very large music
                        collections without running out of memory.
  -q, --quiet           Do not print informational messages.
  -v, --verbose         Print debug messages that are probably only useful if
                        something is going wrong.

---

pi@raspberrypi:~/Desktop/muza $ rganalysis . -n
Traceback (most recent call last):
  File "/home/pi/berryconda3/bin/rganalysis", line 17, in <module>
    plac_call_main()
  File "/home/pi/berryconda3/bin/rganalysis", line 11, in plac_call_main
    return plac.call(main)
  File "/home/pi/berryconda3/lib/python3.6/site-packages/plac_core.py", line 330, in call
    cmd, result = parser.consume(arglist)
  File "/home/pi/berryconda3/lib/python3.6/site-packages/plac_core.py", line 207, in consume
    return cmd, self.func(*(args + varargs + extraopts), **kwargs)
  File "/home/pi/berryconda3/lib/python3.6/site-packages/rganalysis/main.py", line 130, in main
    raise BackendUnavailableException("Could not find any usable backends.")
rganalysis.backends.BackendUnavailableException: Could not find any usable backends.

---

pi@raspberrypi:~/Desktop/muza $ rganalysis .
Traceback (most recent call last):
  File "/home/pi/berryconda3/bin/rganalysis", line 17, in <module>
    plac_call_main()
  File "/home/pi/berryconda3/bin/rganalysis", line 11, in plac_call_main
    return plac.call(main)
  File "/home/pi/berryconda3/lib/python3.6/site-packages/plac_core.py", line 330, in call
    cmd, result = parser.consume(arglist)
  File "/home/pi/berryconda3/lib/python3.6/site-packages/plac_core.py", line 207, in consume
    return cmd, self.func(*(args + varargs + extraopts), **kwargs)
  File "/home/pi/berryconda3/lib/python3.6/site-packages/rganalysis/main.py", line 130, in main
    raise BackendUnavailableException("Could not find any usable backends.")
rganalysis.backends.BackendUnavailableException: Could not find any usable backends.
pi@raspberrypi:~/Desktop/muza $ 

---

Currently on WIndows on my debug build I have the same situation: also -h works, and if not -h I have the same error:

File "c:\Users\fun\Dropbox\repos\GitHub\rganalysis\rganalysis\main.py", line 131, in main
    raise BackendUnavailableException("Could not find any usable backends.")
rganalysis.backends.BackendUnavailableException: Could not find any usable backends.

[DarwinAwardWinner]

Did you see the note in the README about installing the prerequisites for one of the backends?

[DarwinAwardWinner]

I should improve that error message, though.

[karolzlot]

Now I see it ;-)