uCOS and 8051

This is my first post in this forum, i am starting with
uCOS,i have gone through the uCOS book and have also downloaded the
port for 8051 by John X. Liu, i am using keil 8.02(2k version) and its mentioned in
the port files that the uCOS functions to be reentrant.

when i compile i get these errors

ucos_ii.h(117): warning C322: unknown identifier

ucos_ii.h(976): error C320: "OS_CFG.H, Missing OS_FLAG_NAME_SIZE: Determines the size of flag group names"

even after making the function reentrant as per keil grammer i get the same errors

I also want to know that to which 8051 ports; uCOS is ported
and what are the minimum stack requirements for uCOS.

waiting for a positive responce.....
Divya