Update: When I go into the Armory.app/Contents/MacOS folder and double-click on the Armory binary there, the Terminal shows up and this error is displayed before the program quits:
Did you follow my instructions and do a
make clean, followed by a complete rebuild? Long story short, assembly of the Armory package wasn't completed when you encountered the initial error; it just won't have everything you need, including Twisted, which is included inside the package (i.e., you shouldn't install it using
brew).
Again, to be clear, there's no need to install Twisted on OS X; the build script takes care of that and downloads all the required runtime code. There's no need to update the documentation, at least in this regard. (Also, yes, I know the OS X build process is kinda wonky. Sorry. It's what was inherited a couple of years ago. It works but is far from ideal. Armory's former intern, Joseph, came up with a solution that would've been awesome. Alas, unless somebody's willing to spend days, if not weeks, rewriting his code from scratch, it can't be used.)