strange error while surfing the net

i got this while trying to compare aim "add-ons"

"Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)"

whats that mean? and if i can fix it, how do i?

while your posting, have any suggestions of aim addons? i use aimutation but i want to upgrade to the newest aim, to use the video chat and other stuff but dont want all the extra junk.