emacs - tern auto-complete gives ac-show-menu (wrong-type-argument stringp nil) -

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i'm trying tern autocomplete working. i'm on osx 10.10

stacktrace: http://pastebin.com/fdsc2ymv

i found link maybe regarding issue: https://github.com/auto-complete/auto-complete/issues/309

my version of popup latest (0.5.1)

here segment of init.el looks like

;; javascript mode (require 'js2-mode) (add-to-list 'auto-mode-alist '("\\.js\\'" . js2-mode)) (add-hook 'js2-mode-hook (lambda () (tern-mode t))) (eval-after-load 'tern    '(progn      (require 'tern-auto-complete)      (tern-ac-setup)))

any ideas? i've tried directly copying repo, adding load path, i'm inclined believe it's auto-complete.

not sure if problem, had error until added .tern-project file project root directory.

{   "plugins": {     "node": {     }   } }

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