Hi,
would be helpful to get some feedback which version of our software you are using currently. E.g. if you did use Kali it only ships with a very old, broken and outdated version. See About the Greenbone Source Edition (GSE) category for more details about our releases. Most of the time it is easiest to try our Community Virtual Machine About the Greenbone Community Edition (GCE) VM category to get some reasonable first results.
Most of such issues are caused by outdated software components or wrongly configured OS or services. Therefore we currently can only offer professional support if you are using one of our appliances which have a defined and well known base system.