Ok. Thanks for sharing this.
Are you happy to start afresh?
If Yes ,
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Exit Engine Prime
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Go to Finder > Music and rename the engine folder to something else e.g. “engine folder back up”
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Disk utility > format the Target drive (USB stick) as exfat (MBR partition is fine)
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Now start up Engine Prime
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Click on the Serato tab in Engine Prime > Refresh/Update collection
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Now add each Serato main crate to Engine Prime collection tab (right click on each main serato crate, import as crate)
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Plug in the USB stick and try using Sync Manager again