What the hell does it mean when get an error that is called <unknown> :?

i dunno 8)

erm, it means windows technician got bored fo coding for the millions and millions of errors windows has... thats what he did for the last 999,999

when/where are you getting it?

Its the only type of illegal error I've been getting.

It means you got OWNED by Steam

I get some of those errors sometimes.FA crashes in the middle of a map and give that error to me.and sometimes it just boots me to my desktop.i figured it was just some steam bugs not worked out yet cause it doesnt happen very often but when it does its usually when the server is running the crates map, rubble or iwojima

heh, thats a funny one. but whats even funnier is that when my brother tried to open something he got an error that said "the file exists"