Dear list

I am at my wits end. Can someone please explain to me why MPASM won't allow
me to do the following:

    LIST P=16F874
    include p16F874.inc
EXTERN RX, jump
    CODE
RECEIVE_BYTE
.....
    bsf jump,RX ; set bit for jump
......
    return
end

I keep getting this error when trying to make an object file

Error[151]   E:\OBJECT\MAST232O.ASM 35 : Operand contains unresolvable
labels or is too complex

Stephan