Mac OS X + SVN 1.5.1 = Branch problem

 -------
 
 mvn release:branch -DupdateBranchVersions=true -DupdateWorkingCopyVersions=false -DbranchName=stuff-1.0.10.X
 
 .....
 
 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 '/svn/flash/Stuff/branches/stuff-1.0.10.X/Stuff/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:361)
     at org.apache.maven.shared.release.DefaultReleaseManager.branch(DefaultReleaseManager.java:332)
     at org.apache.maven.plugins.release.BranchReleaseMojo.execute(BranchReleaseMojo.java:130)
     at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451)
     at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:558)
     at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:512)
     at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:482)
     at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:330)
     at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:227)
     at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142)
     at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)
     at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
     at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)
     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 '/svn/flash/Stuff/branches/stuff-1.0.10.X/Stuff/pom.xml' already exists