cannot launch on multiple computers

edit

Using Ros Electric and Ubuntu 11.10

I'm attempting to run a launch file from my control computer and have some nodes run locally and some on the remote computer.

My launch files looks like this:

<launch>
    <machine name="Controller" address="localhost" default="true" >
        <env name="ROSLAUNCH_SSH_UNKNOWN" value="1" />
    </machine>
        <node some_local_nodes />

        <include file="$(find remote_pkg)/launch/app.launch"/>
</launch>

<launch>
    <machine name="MYREMOTE" address="MYREMOTE" default="never" user="me" password="my_password">
    </machine>

        <node machine="MYREMOTE" my_remote_app_nodes />

</launch>

What I get when I run my roslaunch command is:

remote[MYREMOTE-0] starting roslaunch
remote[MYREMOTE-0]: creating ssh connection to MYREMOTE:22, user[me]
remote[MYREMOTE-0]: failed to launch on MYREMOTE:

MYREMOTE is not in your SSH known_hosts file.

Please manually:
  ssh me@MYREMOTE

then try roslaunching again.

If you wish to configure roslaunch to automatically recognize unknown
hosts, please set the environment variable ROSLAUNCH_SSH_UNKNOWN=1


[MYREMOTE-0] killing on exit
unable to start remote roslaunch child: MYREMOTE-0

I know that the remote computer is in my know_hosts file and I followed the instructions here but I continue to get the same error.

I've tried it with/out passwords and with/out the ROSLAUNCH_SSH_UNKNOWN=1

Any suggestions?