Error In Keil

Hi all,
i am working on am small project using 89s52.
can anybody please help me with the error in keil..
while compiling i am getting an error in keil...

*** ERROR L105: PUBLIC REFERS TO IGNORED SEGMENT
    SYMBOL:  REEAD
    SEGMENT: ?DT?SAS_WITH_RTC
Program Size: data=136.1 xdata=0 code=4953
Target not created

what does this error mean.
how can i get out of this...