Error in Room Directory Discussion

I am using EP6 SP4.
If I try to access the discussion page within a room I obtain a NullPointerException.
I am longged on with a user with admin role and the discussion page within the personal documents works fine.
java.lang.NullPointerException
     at java.util.Hashtable.put(Hashtable.java:375)
     at com.sapportals.wcm.repository.service.discussion.wcm.DiscussionAppPropertiesService.getAppPropService(DiscussionAppPropertiesService.java:42)
     at com.sapportals.wcm.repository.service.discussion.wcm.Discussion.getNumberOfTopics(Discussion.java:552)
com.sapportals.wcm.repository.ResourceException
     at com.sapportals.wcm.repository.ResourceException.fillInStackTrace(ResourceException.java:401)
     at java.lang.Throwable.(Throwable.java:85)
     at java.lang.Exception.(Exception.java:33)
     at com.sapportals.wcm.WcmException.(WcmException.java:107)
     at com.sapportals.wcm.WcmException.(WcmException.java:103)
     at com.sapportals.wcm.util.content.ContentException.(ContentException.java:46)
     at com.sapportals.wcm.repository.ResourceException.(ResourceException.java:274)
     at com.sapportals.wcm.repository.service.discussion.wcm.Discussion.getNumberOfTopics(Discussion.java:561)

I wrote to OSS about this problem.
The reply:
Please try the following to resolve the issue:
Go to System Administartion > System Configuration > Knowledgemanagement> Configuration > Content Management > Repository Managers >
CM Repository > roomStructures.
Edit roomStructures and enable the repository service 'properties'.
Restart the J2EE after changing this.
SOLVED THE PROBLEM
Thanks.

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