pic16f872

hie guys
iam using pic16f872 for my project and i have tried to build it and it gave me the following three errors
ENG\PROJECT\F872TMPO.ASM 86 : Duplicate label ("TRISA" or redefining symbol that cannot be redefined)
Error[115] D:\HIT\PART3\COMM ENG\PROJECT\F872TMPO.ASM 87 : Duplicate label ("TRISB" or redefining symbol that cannot be redefined)
Error[115] D:\HIT\PART3\COMM ENG\PROJECT\F872TMPO.ASM 88 : Duplicate label ("TRISC" or redefining symbol that cannot be redefined)
can anyone help me
thanks
sam