me too sometime it says that, just wait, or connect the default preferences Scope. and then for me its work.

nobody know somethings about that ? it will help me so much. Thanks

Hey thanks for the video very nice and easy
i was wondering i scanned my network and, the scan scan every adress but some are not used so i was wonderfing if an option exist for scanning a network...

you can just go the package manager and search OpenVAs and you will see OpenVAS 3.0 and then install it.
i did it and its work well