This error means you don’t have openvas-libraries installed. Personally I would start from scratch and install OpenVAS/GVM from a single package source.
Therefore please contact the distributor of your OpenVAS/GVM packages on howto install and setup OpenVAS/GVM.
The Greenbone Community Edition (GCE) is a virtual machine directly provided by Greenbone. You are using packages from a third party (Greenbone doesn’t provide packages for any distribution) therefore you are using the Greenbone Source Edition (GSE).