Internal osilator

I am trying to set my PIC16F913 to use a internal ossilator in code without changing any other files. acording to another post i just add "@__config _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _CP_OFF" to the code but i get a error on compiling "Overwriting previous address contents" can any one shed some light on this

Code:

INCLUDE "MODEDEFS.BAS" Asm __config _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _CP_OFF ERRORLEVEL -306 Endasm 'DEFINE OSC 4 ' Define crystal as 4Mhz '*ADC setup* DEFINE ADC_BITS 10 'SETS NUMBER OF BITS IN RESULTS 8,10,12 DEFINE ADC_CLOCK 3 'SETS CLOCK SOURCE (RC = 3) DEFINE ADC_SAMPLEUS 50 'SETS SAMPLING TIME IN MICROSECONDS 'This Part set PORTA 0-5 an analog inputs ADCON1 = %01110000 'FRC (clock derived from a dedicated internal oscillator = 500 kHz max) ANSEL = %00000011 'PortA 0 & 1 Analog 2 - 5 Digital 'The ANSEL (91h) and CMCON0 (9Ch)registers must be initialized to configure an CMCON0 = %00000111 'analog channel as a digital input. Pins configured as analog inputs will read ‘0’. TRISA = %00001111 'set PORTA 0-4 as inputs PORTA 5 output ADCON0.7 = 1 'Right justify output of ADC datasheet P145 of 16F913 LCDCON = 0 'Disable LCD function on PORTC 0 - 2 TRISC = %00000000 'Set PORTC as output TRISB = %00000000 'Sert PORTB as output