as u said it asking for that palette. so recheck your character is it really use that palette. check from your mysql db
If yes, thats weird since new character should use default palette color which is really limited since you said u use very old client.
did u enable palette that big ? as default the palette is 0 so it should read correctly. see also your client.conf about the hair color .
btw use clean rathena https://github.com/rathena/rathena I dont even know if u have customized or something that breaks those
from your screenshot character looks weird so thats why I assume its your encoding of your iteminfo.lua.
And im pretty sure its there. go recheck your related iteminfo content with that error.
Most probably your encoding or anything related to iteminfo for that custom item. recheck. make sure its exactly the same name as the sprite should be.
If its equipments maybe can try https://x-files.amirazman.my/customfilegenerator/ or can also use that for others just need to modify some parts.
I didnt tried this yet, but most probably the preview cash shop, check your src. either enable or disable it. I dont know which 1 since I didnt tried that client yet.