osx - Navigating Phoenix's or Elixir's Codebase in Vim using cTags -

this setup:

mac os          10.12.1 vim             8.0.52 exuberant ctags 5.8 

my .vimrc has: set tags=tags

i generate tags file using ctags -r . within project root directory , generated file called tags in same folder.

the ctags navigation within own project files work fine. whenever try see source code phoenix framework (or dependencies)

e426: tag not found: mix 

how fix , navigate phoenix's source code?

turns out i've somehow corrupted project's installation.

after trying fix tags specific issue, decided give , move on. trying run mix phoenix.server got:

unchecked dependencies environment test: 

(...) list of dependencies, including final one:

* phoenix_ecto (hex package)   dependency not available, run "mix deps.get" ** (mix) can't continue due errors on dependencies 

i have no idea how happened. ran mix deps.get again , had run npm install again. (phoenix uses brunch)

after that, ran $ ctags -r . on project's root directory , working fine: both project , ctags navigation, including phoenix's , elixir's source code.