Our tools natively converts DXF files (eg: import/Export). However if a user wants to import a DWG, we use a 3rd party tool to convert the DWG -> DXF in the background. That message means the component ../bin/Activeconverter.dll wasn't properly registered during installation - here's more information, https://support.numericalinnovations.com/support/discussions/topics/14000019602
I would recommend trying to either re-install again and see if that registers the component, or just import as a DXF file instead of DWG (DXF and DWG are essentially identical except DXF is ASCII. Plus. DXF is the most widely used CAD format.)
Lately when I import DWG I get a message that AutoDwg is unregistered. This appears to be a 3rd party converter that is part of Fab 3000. How can I correct this?