udata_Tx.o cannot fit the section. help needed

Hi…

Am new to RTRT and PIC…

In verification stage, when i try to build a file (x.ptu for the source file x.c, using Rational Test Real Time), the following error is encountered…
Error -section. ‘udata_Tx.o’ can not fit the section. Section ‘.udata_tx.o’ length=0x00001368

Environment:
Controller used is PIC18f4620
and MPLAB IDE v7.50
RTRT(Rational Test Real Time ) v7.0

Pls help me to get through this…

Thanks in advance…

Kumar.