I have another file and have tried this again. I am getting the same error, and I have also removed the BPM plugin as its code contains a typo that that error is no longer in the log.
The error is: Fingerprint calculator failed exit code = 1, exit status = 0, error = Unknown error
I looked into this a bit further and installed the Acoustid Fingerprinter application. While trying to use this to fingerprint the audio file, it tells me that no audio files are in the selected directory. After reviewing some documentation, I was sure to verify that the audio file was in fact tagged, since I saw a note that only tagged audio files are submitted.
I am using Ubuntu 17.10 and have verified that my chromaprint is 1.4.2-1, which according to the web site, 1.4.2 is the most current version. I have also verified that both the separate acoustid fingerprinter and picard can fingerprint other audio files just fine. I have verified the specific audio file here can play from begin to end without issues, and tried multiple players.
Since the issue is on all Opus files I have tried, I question that maybe there is a sensitivity to something like the encoder used, the encoder settings, specific metadata tags or combination thereof, etc. I know that AAC/M4A does have this issue where there is (mostly in the past) a sensitivity of iTunes and non-iTunes encoded files. There is also the issue as with MP3 files where there are multiple versions/formats a tag can have, and some programs may not be able to read all tag formats. I am only aware of the Vorbis formatting option for Opus though.