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Hi, maybe a bit too late, but may be helpful for other readers:

You need to add the attribute type="string" to the device_id parameter in device.launch Line 30 /opt/ros/groovy/share/openni_launch/launch/includes/device.launch

Hi, maybe a bit too late, but may be helpful for other readers:

You need to add the attribute type="string" to the device_id parameter in device.launch Line 30 device.launch

/opt/ros/groovy/share/openni_launch/launch/includes/device.launch

Change Line 30 (groovy) from:

<param name="device_id" value="$(arg device_id)" />

to

<param name="device_id" value="$(arg device_id)" type="string" />