Server error at forge (in General)

OK, so I've been having this error for a while, but it was inconsequential until now since to me forging is just a novelty. I'm not sure why, but now I have the strong urge to forge my new kite shield a lot; however, when I try to load the forge from businesses->forge, I get:

Server Error
The requested URL cannot be accessed due to a system error on this server.

AOLserver/4.5.0 on http://www.carnageblender.com/

I get this with both IE and FF 3.0.7, XP SP3, but since no one else is complaining I guess this is my very own problem? TIA.

PS I hope this is the right place.

i don't have any problems with it, it may be your active character tho, make sure the one your forging with is the active one

if that doesn't work click the link businesses and open forging into a new window/tab

"make sure the one your forging with is the active one "
How do I do this? Prompted by your advice, I've discovered that I can enter the forge with my other two characters. One has no items to forge, but the other is able to forge properly (but it only has 21k mpr).