Cant get Annihils to work

[Snorlax]

I have normal diablo 2 working
Made a copy of the folder and downloadedannihilus into it. i did patch update and installed into it too. I have also restarted my computer.
But then i try to run annihilus i get error?

[FromTheRez]

Can you tell us what the error message is?
What patch did you revert to?