Symbol not previously defined (TRISA)

Question

                    list P=16f54
#include <p16f54.inc>

; CONFIG
; __config 0xFFFB
 __CONFIG _OSC_RC & _WDT_OFF & _CP_OFF 
    
  org    1FFH
  GOTO    Start                   ; go to beginning of program
  org     0
   
Init     clrf    PORTA   ;reset ports  
  clrf     PORTB
  movlw    b'00000000'           ;set port-a I/O   
  movwf    TRISA
  movlw    b'00000000'          ;set port-b I/O
  movwf    TRISB
  retlw     0

Start
   call      Init
Main
   bsf       PORTA,  0
   GOTO      Main                          ; loop forever

    End

Answer 1

Check the datasheet of your target device:

PIC16F54 | Microchip Technology

According to this datasheet, PIC16F54 doesn't have TRIS registers in the register file.
Instead of general instructions like MOVWF, you should use the special TRIS instruction to set TRIS registers in PIC16F54.

  movlw    b'00000000'           ;set port-a I/O   
  ;movwf    TRISA
  tris     PORTA
  movlw    b'00000000'          ;set port-b I/O
  ;movwf    TRISB
  tris     PORTB