means your DB isnt connecting, most times caused by a wrong user name or password, could also be "whitespace" in the fields, could be many other reasons dealing with the connection.

<<EDIT>>

Did a search for the exact name of your thread, many many threads in that search had answers.

FNW linked this in the second post (the one right under yours in the search by the way)

http://dev.mysql.com/doc/refman/5.0/en/gone-away.html