I am getting it too :-(
Oops Server error
Thats ok then, thanks for letting me know I'm not the only one suffering.
*hands out tea and biscuits whilst we wait*
It was bad enough that I was tanking my own tactics trainer rank, but now the server is conspiring against me too. :(
I hope there will be some extension of time to move in current games because of these issues. I am unable to make any moves before I have to leave for work. 
This is an intermittent error that seems to be across the site. We're sorry about this and we are working to correct this as soon as possible.
Maybe Erik et al are adding in some new features? Can't say that I wouldn't be overjoyed to have the wildcard for conditional moves... 
Our fingers made a dubious move... and now you have to see this boring post. Sorry!
We're working hard to get this issue fixed - it should be just a minute or two. Please check back soon and we appreciate your patience!
Just wanting to check whether I'm the only person getting this message, it seems a bit odd because whenever I click on any link, be it a forum or next game or homepage or whatever, about half the time the server error page comes up, then i refresh and it works as normal. Makes games hard as I keep having to make the same move over and over before it actually registers it, plus it takes quite a bit of effort to get back to the page with the game anyway.
If its a known problem its fine, I'm just wondering whether its a problem on my side of things. Thanks.