Hi, can you please check whether the same happens with the current version? Download it from:
github.com/unreal4u/rutverifier
The class posted on this site is outdated and shouldn't be used anymore, all current code is available via composer or directly on Github.
You can also open an issue or pull request over there :)
Out of curiosity, which version of PHP are you running? If you are below 5.3.X, I recommend updating because this class uses namespaces, which are available from 5.3.0, but while you're at it, upgrade to 5.5 or 5.6 which is the current version, and the actual one supported by this package.
Greetings.