Every so often I get the following error:

"You cannot activate this action without being at the same coordinates as it! It is possible that you reached this message through a web browser glitch, or through malicious intent."

I'm not to sure I understand what it means, can someone help?

I think it's due to browser lag, I've gotten it as well while the game/my browser was running slow. It seems to happen when you try to attack (or move maps) on a space you aren't actually on, because it hasn't updated your position yet.

Ohh right, thanks for clearing that up

I've seen it a few times in Chrome if you go back in your browser's history then try to move. For some reason, it stores a fastback cache of the DOM state /before/ you moved. It doesn't always happen, and I can't reproduce it on other browsers so far.