If you installed bss using pip install bss, then I’m suspecting it must be installed in /usr/local/lib/python2.7/site-packages/bss or some such location.
Did you move the bss folder to /Applications by any chance?
I noticed you typed /Application/
In the command you actually ran, I’m assuming you typed /Applications/ since that’s the correct folder name on Mac.
PS: I should also let you know, that we are moving bss from python to R in the future. The release will happen before the end of this month. So if you were not in a rush to analyze the data, you could wait for the r package release. Just a thought.