release:branch hit remoteTagging problem

[INFO] Working directory: /Users/benson/x/rex2009-trunk/java
org.apache.maven.shared.release.scm.ReleaseScmCommandException: Unable to branch SCM
Provider message:
The svn branch command failed.
Command output:
svn: Commit failed (details follow):
svn: File '/engineering/rex2009/branches/rlp_7.1/annotatortools/pom.xml' already exists

	at org.apache.maven.shared.release.phase.ScmBranchPhase.execute(ScmBranchPhase.java:98)
	at org.apache.maven.shared.release.DefaultReleaseManager.branch(DefaultReleaseManager.java:379)
	at org.apache.maven.shared.release.DefaultReleaseManager.branch(DefaultReleaseManager.java:350)
	at org.apache.maven.plugins.release.BranchReleaseMojo.execute(BranchReleaseMojo.java:133)
	at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:483)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:678)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:553)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:523)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:371)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:268)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:181)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:356)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:137)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:356)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
	at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
	at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
	at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Unable to branch SCM
Provider message:
The svn branch command failed.
Command output:
svn: Commit failed (details follow):
svn: File '/engineering/rex2009/branches/rlp_7.1/annotatortools/pom.xml' already exists