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Technically you can not start searching or debugging the error I tried scanning a fresh installed sim with SU8 embedded during install, it was ok and all default airports + my addons in community folder was processed (added to database) Then I updated to SU9, tried a new scan with a fresh installed vmsAcars, it went well too and all my airports was found. One of my friends (a pilot of a VA I manage) faced the same issue, formatted his sim pc and fresh installed the sim (probably with SU8 like me), it went well and he is happy now. Another one (from the same VA) had the issue, he tried only re-installing the sim but he was not able to scan like you. I am not telling you to format your disc of course, but this is a strange error and I "assume" it is something broken at msfs and this happened probably when switching from SU7 to SU8 (or in between them somehow maybe with a world update etc, maybe not detected) and now with SU9 it is effecting more pilots Anyway, looks like only workaround now is using another pilots msfs_nav.db file (get it from a friend, place it on top of yours, do NOT re-sync until this problem is identified and fixed). I know, it will be missing your addons placed at community folder if you are not using the same addons with that pilot but at least you will be able to start a flight with acars. Hope it helps

In MSFS, are you using SU9 or SU8 or another SU? Steam version or MS store version? Some have reported issues - check the 'vmsacars, #support' channel in Discord.