Intro:
I have Skyrim SE. I just recently began installing mods and I managed to install quite a few mods before quickly reaching my limit in the normal FNIS. They are all work properly when I was use them. I looked around and discovered that FNIS XXL allows you to have more mods. I uninstalled all my mods then redid the FNIS installation but with XXL.
Issue: Once I installed XXL I did an update and it found 30+ errors. This was clearly bad. Anyway, I ran the game using SKSE. I c
Weird that the 1st warning doesn't go away. But also, the FNIS you installed is not for SE. That line Grey Cloud pointed is clearly telling you this. FNIS for SE reads Skyrim 64bits
It's in the description page for FNIS. Check these mods, read how to use them and add whichever you seem fit.