for any new players that have huge error blocks this is how you fix it.

  1. download moonshadestuff.rar
  2. extracted it out of the .rar file
  3. locate your csgo models, and materials folders (right click csgo on steam library, properties, local files, browse local files, csgo)
  4. delete your models, and materials files
  5. move the models and materials from the moosnahdestuff file into the same csgo directory they where in before

download link >> https://mega.nz/#!brx2FQoB!UM1a6rz_mcbLorK-DStSBQWweqkX6RxwQVIvF7aC_Qs

yes this happened to me a lot when my hard drive on my old computer kept die-ing every 2 months.
I appreciate that there is a post on this now lol.