I encountered a similar problem which was overcome by ripping a CD using dBpoweramp and then importing the folder into Sooloos.
Initially Sooloos tried to find the metadata and when it could not I simply accepted the transfer which at least includes basic info from the dBpoweramp tagging.

Meridian M80 & Meridian Ellipse
Gone:7200SEs,808v6,G95,MC200,MS200,218,210,MD600,F80, Explorer 1,201Pre mk3