Cannot use tern commands in command mode

[lxynox]

Safe and peace to all, i really need some help to get this plugin work.

The Manual Page works fine in vim which implies it's successfully installed(i think), the plugin is also included in the vim's &rtp.

Output of runtimepath of vim:

/Users/lxynox/.vim,/Users/lxynox/.vim/bundle/Vundle.vim,/Users/lxynox/.vim/bundle/ctrlp.vim,/Users/lxynox/.vim/bundle
/The-NERD-tree,/Users/lxynox/.vim/bundle/indentLine,/Users/lxynox/.vim/bundle/tern_for_vim,/Users/lxynox/.vim/bundle/
tagbar,/Users/lxynox/.vim/bundle/emmet-vim
......
,/Users/lxynox/.vim/bundle/indentLine/after,/Users/lxynox/.vim/bundle/tern_for_vim/after,/Users/lx
ynox/.vim/bundle/tagbar/after
......

However, when i ran some tern commands like :TernDoc,

E492: Not an editor command: TernDoc

will popup, other plugins work fine besides those who have dependency on this one. I even didn't add any configuration for this plugin into .vimrc yet. Can anyone help a little bit?

Note: I'm using vim7.4, Mac EI Captain.

[lxynox]

Looks like this is because of i am trying to invoke it when editing filetype other than JS.