ValueError: could not convert string to float: N/A

[peoplecallmefrancois]

I got this error. What am I doing wrong?

File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/converter/__init__.py", line 162, in convert info = self.ffmpeg.probe(infile) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/converter/ffmpeg.py", line 367, in probe info.parse_ffprobe(raw) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/converter/ffmpeg.py", line 253, in parse_ffprobe self.format.parse_ffprobe(k, v) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/converter/ffmpeg.py", line 78, in parse_ffprobe self.duration = float(val) ValueError: could not convert string to float: N/A