Travis CI doesn't trigger build for commits

I linked Travis CI to my repository and added .travis.yml file but not build is triggered on commit, I found on requests pages that the job was rejected saying:
File MohamedIbrahimElMetwaly/Book-Store:.travis.yml not found on RemoteVcs


Hi, @MohamedIbrahimElMetw,

No .travis.yml appears to be in your root directory of your project.