I installed m2release plugin into Hudson and got the below error information after start to perform maven release.

ERROR: Processing failed due to a bug in the code. Please report this to hudson-users@googlegroups.com
java.lang.NullPointerException
at org.jvnet.hudson.plugins.m2release.M2ReleaseBuildWrapper.getReleaseVersion(M2ReleaseBuildWrapper.java:345)
at org.jvnet.hudson.plugins.m2release.M2ReleaseBuildWrapper.setUp(M2ReleaseBuildWrapper.java:161)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:516)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:417)
at hudson.model.Run.run(Run.java:1362)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:400)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:145)
project=hudson.maven.MavenModuleSet@3fcf59[Test]
project.getModules()=[]
project.getRootModule()=null
FATAL: null
java.lang.NullPointerException
at org.jvnet.hudson.plugins.m2release.M2ReleaseBuildWrapper.getReleaseVersion(M2ReleaseBuildWrapper.java:345)
at org.jvnet.hudson.plugins.m2release.M2ReleaseBuildWrapper.setUp(M2ReleaseBuildWrapper.java:161)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:516)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:417)
at hudson.model.Run.run(Run.java:1362)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:400)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:145)