In the /pkg/rc/rc_nfsd script there are two lines in the 'stp)' section that have 'killall -HUP xxxx' which I took directly from another script. The '-HUP' command is not supported in FREESCO with the 'killall' scriptin that format. It should be changed to 'killall xxxxx -HUP'
I have re-packaging and uploaded it so you can either re-install it or make the changes yourself.