During startup or after a servo bus reset V+ has detected two or more servo nodes with the same serial number. Either an error has occurred with servo node detection or a servo node is configured incorrectly. Servo network operation is not allowed. Use the SRV.NET command to determine which nodes are causing this error. Reinitialize your servo network. Reboot your robot controller. If a new servo node has been added to the network verify that its serial number is correct. If the problem persists contact Adept Customer Service.