build failed by PluginException

I got this error message while building with 'build.bat x86'

assemble-plugins:
org.jnode.plugin.PluginException: Required attribute license-name in element plugin not found
at org.jnode.plugin.model.AbstractModelObject.getAttribute(AbstractModelObject.java:48)
at org.jnode.plugin.model.PluginDescriptorModel.(PluginDescriptorModel.java:115)
at org.jnode.plugin.model.Factory.parseDescriptor(Factory.java:48)
at org.jnode.plugin.model.Factory.parseDescriptor(Factory.java:37)
at org.jnode.build.AbstractPluginTask.readDescriptor(AbstractPluginTask.java:82)
at org.jnode.build.PluginTask.buildPlugin(PluginTask.java:93)
at org.jnode.build.PluginTask.execute(PluginTask.java:81)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at org.apache.tools.ant.Target.performTasks(Target.java:369)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
at org.apache.tools.ant.Main.runBuild(Main.java:668)
at org.apache.tools.ant.Main.startAnt(Main.java:187)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)

BUILD FAILED
C:\work\jnode\all\build.xml:148: Building C:\work\jnode\all\build\descriptors\org.jnode.driver.acpi.xml failed