Hello narutard, allow me to try help you,
I'm quite sure you have, some custom content and/or Mod within your sims 3.
first, try to disable those Mod or custom content, and try run your sims 3,
if it still "Texture Missing" then try to delete your Sims 3 Cache, you can try google it, "sims 3 cache delete", read carefully the method and try.
i believe deleting cache will help you.
I'm not sure I'm allowed to put links here, but try google Sims 3 Dashboard. it will help you detect corrupt or conflicting custom content file that messes with sims 3, and also help you to delete cache.