On this device CCP1 is multiplexed with RB0 & RB3. To switch CCP1 you
use CCPMX in CONFIG1.

With CCPMX left un-programmed, CCP1 defaults to RB0.

Try this.
Code:
@ DEVICE HS_OSC,CCPMX_ON,MCLR_ON,LVP_OFF,WDT_OFF,PROTECT_OFF
    ' CCPMX_ON = PWM ON RB3, CCPMX_OFF = PWM ON RB0
DEFINE OSC 20 
TRISB = 0
CMCON = 0
ADCON0 = 0
ANSEL = 0
PR2 = 122 
CCPR1L = 64 
T2CON = %00000100 
CCP1CON = %00001100 

Here:
     GOTO Here