cordova - Phonegap - build fails after including my js files -

i'm trying build phonegap app, error when running:

sudo -e env "path=$path" phonegap build android  error code: 1 unable add '.../app/platforms/android/build/intermediates/assets/debug/www/react-backbone/node_modules/gulp-notify/node_modules/node-notifier/node_modules/semver/semver.browser.js.gz': file in archive (try '-u'?) error: unable process assets while packaging '.../app/platforms/android/build/intermediates/res/resources-debug.ap_' 

a brand new project builds fine. moment add own css , js files , modify index view, fails. after commenting out external css , js files i'm loading, fails.

could inclusion of foreign directory in www/ confuse phonegap , cause error?

edit:

differences between working app , broken one.

my new index.html:

replaced

<div class="app">   <h1>phonegap</h1>   <div id="deviceready" class="blink">     <p class="event listening">connecting device</p>     <p class="event received">device ready</p>   </div> </div> 

with

<div class="app"></div> 

there css/js imports, commented them out, shouldn't affecting anything.

inside new directory have:

i'll try creating new app , adding directory see if messes up.
will update.

update:
confirmed adding directory causes problem build process. maybe i'm supposed put somewhere else?

update 2:
fixed issue, don't understand problem was, still response if knows.

i created project , reorganized code. stuck of files new directory in js/, in css/, etc. created build directory , didn't cause issues.