This error indicates that you have attempted to retrieve a non-existent [[:settings|setting]].
Things to try:
  * If you are using the ''[[:cmd:show]]'' command in an iPXE [[:scripting|script]] to display the value of a setting, consider using the ''[[:cmd:echo]]'' command instead.  For example:  #!ipxe
  
  dhcp
  echo IP address: ${net0/ip}
You may also want to use the ''[[:cmd:isset]]'' command.  For example:  #!ipxe
  
  dhcp
  isset ${net0/ip} && echo IP address: ${net0/ip} || echo No IP address