I am getting errors when compiling the following

PAGE0
CLRF PORTA
CLRF PORTB
PAGE1
CLRF TRISA
MOVLW b'00001010'
MOVWF TRISA
 CLRF TRISB

I am programming a 16f873 and have got the pages defined as:
#DEFINE  PAGE0 BCF STATUS,RP0
#DEFINE  PAGE1 BSF STATUS,RP0

when compiling i get the message
Message[302] A:\ECU.ASM 108 : Register in operand not in bank 0.  Ensure
that bank bits are correct.

what am i doing wrong

aaron