Rust Error

Hello, I need a little help here, I cant seem to be able to launch my Rust because it keeps giving me this error: Unable to load mono library from “C:/Program Files (x86)/Steam/steamapps/common/rust/RustClient_Data/Mono/mono.dll” (error = 2).
Now I have no clue why this is happening as I was playing rust not half an hour before this happened, if anyone could tell me how to fix this error that would be great! Thanks.

have you tryed cache?