Firewall Management - New Group - Import config from X not working?

I have been trying to setup Firewall groups on central, then importing their configs from an existing firewall.  But It never seems to work, I sometimes see a notification that the config import failed??  I've tried this now several times over the last several weeks, but it always fails when trying to import the config??

Any ideas?? I'm assuming it uses the Central API over the management connection right, as the firewall is accessible from central, I can't see why the import also fails??

Thanks