Oracle DBCA java.lang.NullPointerException

I receive the following error message when I try to run the Database Configuration Assistant on Solaris 8 / Oracle 9i.

Does anyone know the solution to this problem?

I thought it might have something to do with my Java class path.

    Thanks!

java.lang.NullPointerException

        at oracle.sysman.assistants.util.NetworkUtils.getOneLocalListen-
        erProtocolAddress(Compiled Code)
        at oracle.sysman.assistants.util.NetworkUtils.getOneLocalListen-
        erProtocolAddress(Compiled Code)
        at oracle.sysman.assistants.util.NetworkUtils.getOneLocalListen-
        erProtocolAddress(Compiled Code)
        at oracle.sysman.assistants.util.NetworkUtils.getOneLocalListen-
        erProtocolAddress(Compiled Code)
        at oracle.sysman.assistants.util.NetworkUtils.getOneLocalListen-
        erProtocolAddress(Compiled Code)
        at oracle.sysman.assistants.util.NetworkUtils.getLocalListenerA-
        ddress(Compiled Code)
        at oracle.sysman.assistants.util.NetworkUtils.getLocalListenerA-
        ddresses(Compiled Code)
        at oracle.sysman.assistants.util.NetworkUtils.needLocalListener-
        (Compiled Code)
        at oracle.sysman.assistants.util.step.StepContext.setListenersT-
        oUpdate(Compiled Code)
        at oracle.sysman.assistants.util.step.StepContext.<init>(Comp-
        iled Code)
        at oracle.sysman.assistants.dbca.backend.Host.<init>(Comp-
        iled Code)
        at oracle.sysman.assistants.dbca.ui.UIHost.<init>(Compiled Code)
        at oracle.sysman.assistants.dbca.ui.InteractiveHost.<init>(Comp-
        iled Code)
        at oracle.sysman.assistants.dbca.Dbca.getHost(Compiled Code)
        at oracle.sysman.assistants.dbca.Dbca.execute(Compiled Code)
        at oracle.sysman.assistants.dbca.Dbca.main(Compiled Code)

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