Error in deploying ember app on gh-pages by Travis

I want to deploy my front-end made in ember js on gh-pages after successful Travis Build. But when Travis runs it gives error as follows :

after_success

$ bash ./script/gh_deploy.sh cleaning up cleaning up... remote: Invalid username or password. fatal: Authentication failed for 'https://ParthS007:undefined@github.com/fossasia/badgeyay/' Error: git push https://ParthS007:undefined@github.com/fossasia/badgeyay gh-pages exited with nonzero status Error: git push https://ParthS007:undefined@github.com/fossasia/badgeyay gh-pages exited with nonzero status at ChildProcess.<anonymous> (/home/travis/build/fossasia/badgeyay/frontend/node_modules/ember-cli-deploy-git/lib/run.js:19:19) at emitTwo (events.js:106:13) at ChildProcess.emit (events.js:191:7) at maybeClose (internal/child_process.js:920:16) at Process.ChildProcess._handle.onexit (internal/child_process.js:230:5)Pipeline aborted Done. Your build exited with 0. This is the link to files which I have changes in my Pull request for gh-pages deployment https://github.com/fossasia/badgeyay/pull/529/files Please suggest what should be changed for successful gh-pages deployment. Thanks in advance