you must se configuration fuse and add a DEFINE OSC 40 at the top of your code

look here to know how to define your config fuses

the end of your 18f242.inc file look like this
Code:
;Configuration Byte 1H Options
_OSCS_ON_1H        EQU  H'DF'	; Oscillator Switch enable
_OSCS_OFF_1H       EQU  H'FF'
_LP_OSC_1H         EQU  H'F8'	; Oscillator type
_XT_OSC_1H         EQU  H'F9'
_HS_OSC_1H         EQU  H'FA'
_RC_OSC_1H         EQU  H'FB'
_EC_OSC_1H         EQU  H'FC'	; External Clock w/OSC2 output divide by 4
_ECIO_OSC_1H       EQU  H'FD'	; w/OSC2 as an IO pin (RA6)
_HSPLL_OSC_1H      EQU  H'FE'	; HS PLL
_RCIO_OSC_1H       EQU  H'FF'	; RC w/OSC2 as an IO pin (RA6)
so _HSPLL_OSC_1H have to be choose