...
If you messed up the release and you are repeating these steps due to some error, make sure you:
*) Cleanup your local maivenmaven:
mvn release:clean
*) Probably you may need to remove the branch (locally and remotely):
git push apache --delete releases/X.Y.Z-incubating-RC0
git branch -D releases/X.Y.Z-incubating-RC0
*) Remove the tags locally and remotely:
(to see available tags locally) git tag -l
git tag -d X.Y.Z-incubating-RC0
(the previous step's commands should also remove the remote tags)
*) Remove the directory ~/.m2/repository/org/apache/samoa, for the new artifacts to be placed again.
*) Repeat from the beginning the steps!
References
http://www.apache.org/dev/publishing-maven-artifacts.html
...