I have a multi-module maven project. It successfully builds, and the release:prepare successfully competes. However, after all of the steps (looking at console output) have completed, the whole thing fails when it tries to do something with an extra workspace directory that doesn't exist.

Here's the last part of the exception.
Caused by: org.codehaus.plexus.util.cli.CommandLineException: Working directory "/Users/dallwardt/.jenkins/jobs/Vault-test6/workspace/target/checkout/workspace" does not exist!
at org.codehaus.plexus.util.cli.Commandline.execute(Commandline.java:644)
at org.codehaus.plexus.util.cli.CommandLineUtils.executeCommandLine(CommandLineUtils.java:118)
at org.codehaus.plexus.util.cli.CommandLineUtils.executeCommandLine(CommandLineUtils.java:93)
at org.apache.maven.shared.invoker.DefaultInvoker.executeCommandLine(DefaultInvoker.java:149)
at org.apache.maven.shared.invoker.DefaultInvoker.execute(DefaultInvoker.java:102)
at org.apache.maven.shared.release.exec.InvokerMavenExecutor.executeGoals(InvokerMavenExecutor.java:387)
... 36 more
channel stopped
Finished: FAILURE

Here's what the file system looks like:
dallwardt$ pwd
/Users/dallwardt/.jenkins/jobs/Vault-test6/workspace

dallwardt$ ls
Common WzlDocs pom.xml pom.xml.releaseBackup release.properties target

dallwardt$ pwd
/Users/dallwardt/.jenkins/jobs/Vault-test6/workspace/target/checkout

dallwardt$ ls
dev tags trunk

Notice there is no workspace directory under target/checkout. Who is supposed to create an extra workspace folder under target/checkout ?