The Bay is going out of business because of their insistence on remaining a "department store", high prices, and lack of adoption for any new technology.
Their point of sale was still running on DOS last I checked, and the shopping experience felt like it was straight out of the 90s.
I have always had trouble whenever I tried mounting files, and it seems that you're getting the same error, "not a directory".
Stick to mounting directories and you should be fine
/home/Joe/container/caddy:/etc/caddy