Could not release project due to GIT clone error when working in sub-directory

ParentPom
|-- pom.xml (Modules : SampleProjectEAR,SampleProjectWeb,SampleProjectCommons)
SampleProjectEAR
|-- pom.xml (Parent : ParentPom pom.xml)
SampleProjectWeb
|-- pom.xml (Parent : ParentPom pom.xml)
SampleProjectCommons
|-- pom.xml (Parent : ParentPom pom.xml)

mvn release:clean release:prepare release:perform -B -U -X -f ParentPom/pom.xml
[...]
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-release-plugin:2.2.1:perform (default-cli) on project WelcomTutorial: Unable to checkout from SCM
[ERROR] Provider message:
[ERROR] The git-clone command failed.
[ERROR] Command output:
[ERROR] fatal: '/app/DINB/bamboo-agent-home/xml-data/build-dir/WTUT-RELEASE-JOB1/ParentPom' does not appear to be a git repository
[ERROR] fatal: The remote end hung up unexpectedly
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-release-plugin:2.2.1:perform (default-cli) on project WelcomTutorial: Unable to checkout from SCM
Provider message:
The git-clone command failed.
Command output:
fatal: '/app/DINB/bamboo-agent-home/xml-data/build-dir/WTUT-RELEASE-JOB1/ParentPom' does not appear to be a git repository
fatal: The remote end hung up unexpectedly

        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        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.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoFailureException: Unable to checkout from SCM
Provider message:
The git-clone command failed.
Command output:
fatal: '/app/DINB/bamboo-agent-home/xml-data/build-dir/WTUT-RELEASE-JOB1/ParentPom' does not appear to be a git repository
fatal: The remote end hung up unexpectedly

        at org.apache.maven.plugins.release.PerformReleaseMojo.execute(PerformReleaseMojo.java:140)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        ... 19 more
Caused by: org.apache.maven.shared.release.scm.ReleaseScmCommandException: Unable to checkout from SCM
Provider message:
The git-clone command failed.
Command output:
fatal: '/app/DINB/bamboo-agent-home/xml-data/build-dir/WTUT-RELEASE-JOB1/ParentPom' does not appear to be a git repository
fatal: The remote end hung up unexpectedly

        at org.apache.maven.shared.release.phase.CheckoutProjectFromScm.execute(CheckoutProjectFromScm.java:196)
        at org.apache.maven.shared.release.DefaultReleaseManager.perform(DefaultReleaseManager.java:346)
        at org.apache.maven.shared.release.DefaultReleaseManager.perform(DefaultReleaseManager.java:293)
        at org.apache.maven.shared.release.DefaultReleaseManager.perform(DefaultReleaseManager.java:272)
        at org.apache.maven.plugins.release.PerformReleaseMojo.execute(PerformReleaseMojo.java:132)
        ... 21 more
[ERROR]
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException