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Hi Eamon,

This seems to be a USB permission error.

TurtleBot3's Lidar and OpenCR are connected to RaspberryPi's USB. Did you make the USB settings mentioned in the e-Manual? First, check the related links and try again on TurtleBot PC.

http://emanual.robotis.com/docs/en/platform/turtlebot3/raspberry_pi_3_setup/#4-usb-settings

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