It says "No such bucket" while `b2 list_buckets` sees that bucket. I've filed an issue earlier today (it got to Nathan). I'd be happy to provide any details to fix this.
The latter was mentioned in online docs here: https://www.backblaze.com/b2/docs/quick_command_line.html but seems it's REALLY outdated.
The version on github is accurate. https://github.com/Backblaze/B2_Command_Line_Tool
Sorry about the confusion.