Open manipulator x arm

I am getting this error when I try to connect to my open manipulator x. ROS seemed to install properly, not sure what is going on,

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The error you are receiving indicates that ROS is having trouble opening the serial port to communicate with the DYNAMIXEL Servos.

Have you verified that the USB port that the U2D2 is connected to is /dev/ttyACM0 and not a different port on your device, or that you have the correct permissions to access the port?

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Maybe you should give permission to open serial port
On the terminal type this:

sudo chmod a+rw /dev/ttyACM0