PLS-00049: bad bind variable 'X_VARIABLE' - oracle

Question

I'm getting the following error when I trying to get a record from a table, in this case, is (SERVICIOENDIAS)/SERVICETIMEINDAYS and I don't know why I'm getting that errr :
Trigger TRG_CONTROL_SERVICIO compiled
LINE/COL ERROR
--------- -------------------------------------------------------------
20/11 PLS-00049: bad bind variable 'NEW.V_SERVICIODIAS'
Errors: check compiler log
I'm a dummy with Oracle and possibly I may do a lot of mistakes and bad practices, so I'll appreciate it if you can say me that.
CREATE OR REPLACE TRIGGER TRG_CONTROL_SERVICIO
BEFORE
INSERT OR UPDATE
ON SERVICIO
FOR EACH ROW
DECLARE
V_SERVICIODIAS INT;
CURSOR C_SERVICIODIAS IS
SELECT TIEMPOSERVICIODIAS INTO V_SERVICIODIAS
FROM SERVICIO;
BEGIN
FOR R_SERVICIODIAS IN C_SERVICIODIAS LOOP
IF INSERTING THEN
IF :NEW.FECHAREGISTRO > SYSDATE THEN
LOG_AUDIT( USER,
SYSDATE,
'SERVICIO',
'INSERT FECHA INCORRECTA',
'SE EJECUTO EL TRG_CONTROL_SERVICIO');
RAISE_APPLICATION_ERROR(-20000, 'FECHA INCORRECTA, INTENTE DE NUEVO');
ELSE
DBMS_OUTPUT.PUT_LINE('INSERTANDO UN SERVICIO');
END IF;
IF :NEW.V_SERVICIODIAS <= 60 THEN
DBMS_OUTPUT.PUT_LINE('INSERTANDO UN SERVICIO');
ELSE
LOG_AUDIT( USER,
SYSDATE,
'SERVICIO',
'NO SE PUEDE UN SERVICIO MAYOR A 60 DIAS',
'SE EJECUTO EL TRG_CONTROL_SERVICIO');
RAISE_APPLICATION_ERROR(-20000, 'NO SE PUEDE REGISTRAR EL SERVICIO, MUCHAS HORAS',TRUE);
END IF;
ELSIF UPDATING THEN
IF :NEW.FECHAREGISTRO <> :OLD.FECHAREGISTRO AND :NEW.FECHAREGISTRO > SYSDATE THEN
LOG_AUDIT( USER,
SYSDATE,
'SERVICIO',
'PROHIBIDO UPDATE FECHAREGISTRO',
'SE EJECUTO EL TRG_CONTROL_SERVICIO');
RAISE_APPLICATION_ERROR(-20000, 'FECHA INCORRECTA, NO SE PUEDE MODIFICAR ESTA FECHA',TRUE);
ELSE
DBMS_OUTPUT.PUT_LINE('ACTUALIZANDO UN EMPLEADO');
END IF;
END IF;
END LOOP;
END;

Answer 1

In your program V_SERVICIODIAS INT; is a declared variable, so you have to use it syntactically as a variable.
The correct if statement is the following, please try to use it:
IF V_SERVICIODIAS <= 60 THEN

Answer 2

As has been pointed out, V_SERVICIODIAS is a local variable so it's not part of the :NEW pseudorecord. You'd use
IF V_SERVICIODIAS <= 60 THEN
Once you do that, the next issue is that nothing is actually populating that local variable so the if statement can never be true. That's because there is a syntax error in your cursor definition. You use an into clause if you have a select statement that returns a single row not when you're defining a cursor that you plan on looping over
CURSOR C_SERVICIODIAS IS
SELECT TIEMPOSERVICIODIAS
FROM SERVICIO;
Once you fix the cursor definition error, you'd get rid of the local variable entirely and just reference the column from the cursor.
IF R_SERVICIODIAS.TIEMPOSERVICIODIAS <= 60 THEN
Having done all that, however, you're going to encounter a mutating table runtime error because a row-level cursor on the SERVICIO isn't going to be able to query the SERVICIO table. And, unfortunately, at that point it's not obvious how to resolve the problem because it's not obvious why the cursor exists in the first place. Why would you want to loop over every row in the table every time you insert a new row into the table? That doesn't really make any sense.
One possibility is that you don't actually want to loop over every row in the table. Perhaps you want to remove the V_SERVICIODIAS local variable and the cursor definition and the loop and just reference the TIEMPOSERVICIODIAS from the current row.
IF :NEW.TIEMPOSERVICIODIAS <= 60 THEN