Seems to be a compile error. 

Error while compiling EntityScaleManager: 'BaseEntity' does not contain a definition for 'networkEntityScale' and no accessible extension method 'networkEntityScale' accepting a first argument of type 'BaseEntity' could be found (are you missing a using directive or an assembly reference?) | Line: 246, Pos: 28

Are you sure you're on the latest version of Rust? It looks like you are using last month's version of Rust.