REGRESSION: Buld and Install an addon fails

[INFO] Scanning for projects...
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for com.george.app:demo:jar:1.0.0-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-jar-plugin is missing. @ line 54, column 15
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING] 
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building demo 1.0.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[WARNING] The POM for org.apache.maven.plugins:maven-clean-plugin:jar:2.4.1 is missing, no dependency information available
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.267s
[INFO] Finished at: Thu Jul 25 08:52:44 BRT 2013
[INFO] Final Memory: 4M/113M
[INFO] ------------------------------------------------------------------------
[ERROR] Plugin org.apache.maven.plugins:maven-clean-plugin:2.4.1 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-clean-plugin:jar:2.4.1: The repository system is offline but the artifact org.apache.maven.plugins:maven-clean-plugin:pom:2.4.1 is not available in the local repository. -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[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/PluginResolutionException

!ENTRY org.jboss.tools.forge.ui.ext 4 1 2013-07-25 08:52:44.557
!MESSAGE Error logged from Forge Plugin: 
!STACK 0
org.jboss.forge.addon.projects.building.BuildException: Build failed.
	at org.jboss.forge.addon.maven.projects.MavenProjectBuilder.build(MavenProjectBuilder.java:84)
	at org.jboss.forge.addon.manager.impl.commands.AddonBuildAndInstallCommand.execute(AddonBuildAndInstallCommand.java:78)
	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.jboss.forge.furnace.proxy.ClassLoaderInterceptor$1.call(ClassLoaderInterceptor.java:52)
	at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:34)
	at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor.invoke(ClassLoaderInterceptor.java:64)
	at org.jboss.forge.addon.manager.impl.commands.AddonBuildAndInstallCommand_$$_javassist_7fbe78ee-910c-4ba9-aa1b-dcf95619d99f.execute(AddonBuildAndInstallCommand_$$_javassist_7fbe78ee-910c-4ba9-aa1b-dcf95619d99f.java)
	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.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback$1.call(ClassLoaderAdapterCallback.java:84)
	at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:34)
	at org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback.invoke(ClassLoaderAdapterCallback.java:60)
	at org.jboss.forge.addon.ui.UICommand_$$_javassist_f9b5ce0a-b954-4c61-97f6-930356fada4d.execute(UICommand_$$_javassist_f9b5ce0a-b954-4c61-97f6-930356fada4d.java)
	at org.jboss.tools.forge.ui.ext.wizards.ForgeWizard$FinishJob.runInWorkspace(ForgeWizard.java:159)
	at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)