Problems Connecting to SICK LMS 291 Via USB Port

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Hello. When trying to connect the SICK LMS 291 camera to the computer using the navigation stack launch file:

<launch> <node pkg="sicktoolbox_wrapper" type="sicklms" name="sicklms" output="screen"> </node>

<node pkg="robot_2dnav" type="odometry" name="odometer" output="screen">

</node>

</launch>

it hangs at: * Attempting to initialize the Sick LMS... Attempting to open device @ /dev/ttyUSB0

for around ten seconds then responds with:

ERROR: I/O exception - SickLMS::_setupConnection: - Unable to open serial port ERROR: I/O exception - SickLMS::_setupConnection: - Unable to open serial port [sicklms-1] process has died [pid 11826, exit code 2]. log files: /home/jason/.ros/log/2c3bbec6-72be-11e0-b96b-0016ea7abacc/sicklms-1*.log

or using the sicktoolbox_wrapper tutorial- http://www.ros.org/wiki/sicktoolbox_w... - it just hangs at:

*** Attempting to initialize the Sick LMS...
Attempting to open device @ /dev/ttyUSB0

indefinitely. I was wondering if anyone had an idea of what I was doing wrong? I am connected via a serial to usb connector and am running ubuntu 10.10. Also when I open the C: drive it doesn't show that the SICK is connected, and I'm not sure if it is supposed to or not before I correctly run the commands I'm trying to run above. Any help would be greatly appreciated! Thanks, Jason