While trying to raise an exception on failures, it instead raised an
exception for misusing the exception. CalledProcessError is only
supposed to be used when given a return code and a command, and it
prints:
Command '{cmd}' returned non-zero exit status {ret}
Passing an error message string instead, just errored out with:
TypeError: __init__() missing 1 required positional argument
Instead use the subprocess module's base error which does accept string
messages. Everything that used to error out, still errors out, but now
they do so with a slightly prettier console message.
