Flashfig Configuration setup

any one help me on the same, as i use netinstall 5.0 for flashfig
i use my laptop ip as flashfig boot client address ( lap top ip is 192.168.88.100 )
routerboard ip is 192.168.88.1

when connect RB and put command it gives error as attached snap

guide me where i can need to change my setting
flashfig.JPG

any one ???

It looks like the RB is not supporting the flash-boot, try upgrading routerboard firmware with:

/system routerboard upgrade

Regards