apply revision

sungwoo@swdev:~/projects/ex_repo$ repo init -u https://github.com/swcho/ex_repo_manifest.git
remote: Counting objects: 3, done.
remote: Compressing objects: 100% (3/3), done.
remote: Total 3 (delta 1), reused 0 (delta 0)
Unpacking objects: 100% (3/3), done.
From https://github.com/swcho/ex_repo_manifest
   dada480..842b839  master     -> origin/master
project .repo/manifests/
Updating dada480..842b839
Fast-forward
 default.xml | 1 +
 1 file changed, 1 insertion(+)

fatal: manifest 'default.xml' not available
fatal: no revision for project ex_repo_proj_01 within /home/sungwoo/projects/ex_repo/.repo/manifests/default.xml