can't install cloud foundry addon

roo> addon install bundle --bundleSymbolicName org.springframework.roo.addon.cloud.foundry
Target resource(s):
-------------------
Spring Roo - Addon - Cloud Foundry (1.2.3.RELEASE)

Required resource(s):
---------------------
Spring AOP (3.1.1.RELEASE)
Spring Beans (3.1.1.RELEASE)
jcl-over-slf4j (1.6.1)
slf4j-nop (1.6.1)
Spring Core (3.1.1.RELEASE)
Jackson JSON processor (1.6.2)
Data mapper for Jackson JSON processor (1.6.2)
Spring Web (3.1.1.RELEASE)
Spring Roo - Wrapping - aopalliance (1.0.0.0010)
Spring Context (3.1.1.RELEASE)
slf4j-api (1.6.1)
Servlet API Bundle (3.0.0.v201112011016)
Spring Roo - Wrapping - Cloud Foundry API (0.0.1.0010)

Optional resource(s):
---------------------
Spring ASM (3.1.1.RELEASE)
Spring Expression Language (3.1.1.RELEASE)
Common Eclipse Runtime (3.6.0.v20110523)
Java Persistence API 2.0 (2.0.4.v201112161009)
Javax Expression Language Bundle (2.2.0.v201108011116)
JSP API Bundle (2.2.0.v201112011158)
OSGi System Bundle (3.7.1.R37x_v20110808-1106)

Deploying...done.

[org.apache.felix.bundlerepository [6]] Resolver: Install error - org.eclipse.equinox.common
java.lang.NullPointerException: Unable to retrieve signature from stream
at org.apache.commons.lang3.Validate.notNull(Validate.java:222)
at org.springframework.roo.felix.pgp.PgpServiceImpl.isSignatureAcceptable(PgpServiceImpl.java:224)
at org.springframework.roo.felix.HttpPgpUrlStreamHandlerServiceImpl.openConnection(HttpPgpUrlStreamHandlerServiceImp
l.java:110)
at org.apache.felix.framework.URLHandlersStreamHandlerProxy.openConnection(URLHandlersStreamHandlerProxy.java:271)
at java.net.URL.openConnection(Unknown Source)
at org.apache.felix.bundlerepository.impl.FileUtil.openURL(FileUtil.java:199)
at org.apache.felix.bundlerepository.impl.ResolverImpl.deploy(ResolverImpl.java:598)
at org.apache.felix.bundlerepository.impl.ObrCommandImpl._deploy(ObrCommandImpl.java:395)
at org.apache.felix.bundlerepository.impl.ObrCommandImpl.deploy(ObrCommandImpl.java:333)
at org.apache.felix.bundlerepository.impl.ObrCommandImpl.execute(ObrCommandImpl.java:119)
at org.apache.felix.shell.impl.Activator$ShellServiceImpl.executeCommand(Activator.java:286)
at org.springframework.roo.felix.FelixDelegator.perform(FelixDelegator.java:208)
at org.springframework.roo.felix.FelixDelegator.obrStart(FelixDelegator.java:146)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.roo.process.manager.ProcessManagerHostedExecutionStrategy$1.callback(ProcessManagerHostedExec
utionStrategy.java:47) Downloaded 100% of lookup
at org.springframework.roo.process.manager.internal.DefaultProcessManager.doTransactionally(DefaultProcessManager.ja
va:283)
at org.springframework.roo.process.manager.internal.DefaultProcessManager.execute(DefaultProcessManager.java:64)
at org.springframework.roo.process.manager.ProcessManagerHostedExecutionStrategy.execute(Pr
onStrategy.java:44)
at org.springframework.roo.shell.AbstractShell.executeCommandImpl(AbstractShell.java:226)
at org.springframework.roo.shell.AbstractShell.executeCommand(AbstractShell.java:146)
at org.springframework.roo.addon.roobot.client.AddOnRooBotOperationsImpl.installOrUpgradeAddOn(AddOnRooBotOperations
Impl.java:478)
at org.springframework.roo.addon.roobot.client.AddOnRooBotOperationsImpl.installAddon(AddOnRooBotOperationsImpl.java
:396)
at org.springframework.roo.addon.roobot.client.AddOnRooBotOperationsImpl.installAddOn(AddOnRooBotOperationsImpl.java
:441)
at org.springframework.roo.addon.roobot.client.AddOnCommands.installBsn(AddOnCommands.java:62)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.roo.process.manager.ProcessManagerHostedExecutionStrategy$1.callback(ProcessManagerHostedExec
utionStrategy.java:47)
at org.springframework.roo.process.manager.internal.DefaultProcessManager.doTransactionally(DefaultProcessManager.ja
va:283)
at org.springframework.roo.process.manager.internal.DefaultProcessManager.execute(DefaultProcessManager.java:64)
at org.springframework.roo.process.manager.ProcessManagerHostedExecutionStrategy.execute(ProcessManagerHostedExecuti
onStrategy.java:44)
at org.springframework.roo.shell.AbstractShell.executeCommandImpl(AbstractShell.java:226)
at org.springframework.roo.shell.AbstractShell.executeCommand(AbstractShell.java:146)
at org.springframework.roo.shell.jline.JLineShell.promptLoop(JLineShell.java:421)
at org.springframework.roo.shell.jline.JLineShell.run(JLineShell.java:539)
at java.lang.Thread.run(Unknown Source)
Successfully installed add-on: Spring Roo - Addon - Cloud Foundry [version: 1.2.3.RELEASE]
[Hint] Please consider rating this add-on with the following command:
[Hint] addon feedback bundle --bundleSymbolicName org.springframework.roo.addon.cloud.foundry --rating ... --comment "..
."