If a switch port import or export attempt fails, it might be due to one of these reasons:
If the first switch port and phone update process has not yet ended or the Cisco Emergency Responder server is not completely initialized, wait for it to finish before proceeding.
If the Cisco Emergency Responder server is not running, use the control center to restart it.
For information on performing the procedure, refer to the Starting and Stopping a CER Server section of Troubleshooting Emergency Responder.
For more information about resolving Cisco Emergency Responder, refer to these documents: