Modeler: Could not connect to repository

I am having problems getting Modeler to work. I can start the Modeler without a problem on the machine that is running the IS. However when I try and connect vai a remote client (i.e. my PC which running Developer and Modeler only) I get the following exception:

Could not connect to repository:

com.wm.bpm.persist.RepoSessionException: RepoV3 error: com.wm.bpm.persist.RepoSessionException: RepoV3 error: com.wm.bpm.persist.ObjectNotFound: Object not found with key “Persist::named::_root”

at com.wm.bpm.persist.RepoPersistentSession.<init>(Unknown Source)

at com.wm.bpm.designer.DataManager.<init>(Unknown Source)

at com.wm.bpm.designer.BPMPlugin.connectToRepo(Unknown Source)

at com.wm.bpm.designer.BPMPlugin.repoLoginAndPostSetup(Unknown Source)

at com.wm.bpm.designer.BPMPlugin.postRegisterInitialization(Unknown Source)

at com.wm.berkeley.ite.BerkeleyPluginManagerImpl.runPostRegisterInitializations(Unknown Source)

at com.wm.bpm.designer.Main.startupBI(Unknown Source)

at com.wm.bpm.designer.Main.access$000(Unknown Source)

at com.wm.bpm.designer.Main$1.run(Unknown Source)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:337)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)

Any Ideas?