all your timers are in use

ccp1 can use timer 1 or 2 , and ccp2 can use timer 1 or 2 , since you have used both timers else where u need a chip with more timers for another pwm output

i would look at using an 18f device , that includes a lot more for the very simular price
i would recommend the 18f26k22 or 18f26k80( FOR 12BIT ADC) for a 28pin device , or if you like perhaps go 48pin 18f46k22
for About the same pricing , it supports alot more timers , 4 PWM PORTS min