Re: I get this string often when I use mods I probably ripped unsuccessfully...
If you do run into this again, do a 50-50 test. Even a mod cleared for 1.102 or updated since 1.102 might have issues not previous noted. You might also have hit an issue because of mod conflicts, or simply an issue a modder or another Simmer hadn't found. Even on Curseforge, a mod isn't guaranteed to be working.
The one issue we've had recently with Gallery Sims is with ones with a fourth trait, which has caused issues in CAS. This should be fixed as of 1.102. The bug thread for that is here: https://answers.ea.com/t5/Bug-Reports/FIXED-GRO-Wrong-names-and-CAS-Corruption-after-gaining-a-4th/m-p/12395752/highlight/true#M243114
In general, I advise against merging packages. There's no gain to performance from it, you can easily end up with duplicates, and you can end up with mods you can't find to remove.