ok, I type screen -r
and...appear:
here are several suitable screens on:
12404.pts-0.doge3 (12/19/2013 10:21:39 AM) (Detached)
12287.pts-0.doge3 (12/19/2013 10:05:08 AM) (Detached)
Type "screen [-d] -r [pid.]tty.host" to resume one of them.
...now??
it looks you have 2 running in background ... keep only one
use "screen -X -S {session # you want to kill} kill"