Smart previews failed to build

My last import would not build the preview of the raw files. I'm using mac OS High Sierra 10.13.6, and Lightroom classic 9.1 release. I don't think I can update it currently on this operating system. Is this due to the older version, or is there a fix for this?  The raw files I import are from Capture one- IIQ files. I don't adjust the raw files in LR, I just import them for archiving with the high res tifs. Thanks for the help.