Hello,
It seems like something went wrong while upgrading your firmware and this service got corrupted while upgrading. Your only option is to restore your device to factory default configuration or even better re-install this firmware without keeping settings. We know that it will cause you to lose all configuration, but it is the only possible solution that would get rid of this error. Also, could you provide information from which firmware version you updated? Please send a troubleshoot file to me if it is possible via private message from a device that still has this error. You can download troubleshoot file by navigating System > Administration > Troubleshoot.
Regards.