Exception after I restarted the backup broker

[12/01/31 18:25:18] (severe)

com.sonicsw.mf.framework.agent.cache.CacheIsLocked: Configuration cache is locked; the cache directory "/somedir/somedomain/somfilename.cache" is being used by another container which must be shutdown before starting this container.

        at com.sonicsw.mf.framework.agent.cache.impl.ConfigCache.init(Unknown Source)

        at com.sonicsw.mf.framework.agent.cache.impl.ConfigCache.<init>(Unknown Source)

        at com.sonicsw.mf.framework.agent.cache.ConfigCacheFactory.createCache(Unknown Source)

        at com.sonicsw.mf.framework.agent.ci.ContainerResources.createCache(Unknown Source)

        at com.sonicsw.mf.framework.agent.ci.ContainerResources.init(Unknown Source)

        at com.sonicsw.mf.framework.agent.ci.LaunchContainer.deployAndStart(Unknown Source)

        at com.sonicsw.mf.framework.agent.ci.LaunchContainer.main(Unknown Source)

I am not sure which other container is using this cache.

Thanks.