ionic build error code 137

I am trying to build my app for android. It built fine for the first time but there were some typos in first so i edited the html and now i am trying to build the app. It is giving an error with exit status 137. the nodejs is latest so is the npm. I have checked the memory approx 700mb available. New to ionic so now i cannot figure out the mistake. Also rebuilded the node-sass. Nothing is working. it takes too much time after sass started and then gets killed automatically.

Attaching the debug file

14 verbose stack Exit status 137
14 verbose stack     at EventEmitter.<anonymous> (/usr/lib/node_modules/npm/lib/utils/lifecycle.js:279:16)
14 verbose stack     at emitTwo (events.js:106:13)
14 verbose stack     at EventEmitter.emit (events.js:191:7)
14 verbose stack     at ChildProcess.<anonymous> (/usr/lib/node_modules/npm/lib/utils/spawn.js:40:14)
14 verbose stack     at emitTwo (events.js:106:13)
14 verbose stack     at ChildProcess.emit (events.js:191:7)
14 verbose stack     at maybeClose (internal/child_process.js:886:16)
14 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:226:5)
15 verbose pkgid ionic-hello-world@
16 verbose cwd /home/ubuntu/files/ic2017app
17 verbose Linux 4.4.0-64-generic
18 verbose argv "/usr/bin/nodejs" "/usr/bin/npm" "run" "ionic:build" "--" "--v2"
19 verbose node v6.10.1
20 verbose npm  v4.4.4
21 error code ELIFECYCLE
22 error errno 137
23 error ionic-hello-world@ ionic:build: `ionic-app-scripts build "--v2"`
23 error Exit status 137
24 error Failed at the ionic-hello-world@ ionic:build script 'ionic-app-scripts build "--v2"'.
24 error Make sure you have the latest version of node.js and npm installed.
24 error If you do, this is most likely a problem with the ionic-hello-world package,
24 error not with npm itself.
24 error Tell the author that this fails on your system:
24 error     ionic-app-scripts build "--v2"
24 error You can get information on how to open an issue for this project with:
24 error     npm bugs ionic-hello-world
24 error Or if that isn't available, you can get their info via:
24 error     npm owner ls ionic-hello-world
24 error There is likely additional logging output above.
25 verbose exit [ 137, true ]

via Shashank