why my trigger does not work?

I have the following Trigger

DROP TRIGGER IF EXISTS test; CREATE TRIGGER test BEFORE UPDATE ON traco_activities FOR EACH ROW INSERT INTO bitacora_tarifas(fecha) VALUES (NOW())

but it does not work, and I got it the following error:

1442-Can´t update table 'bitacora_tarifas' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.

the structure of the table bitacora_tarifas is the next:

id, mediumint fecha, datetime

The "id" is autoincrement i tried :

FOR EACH ROW INSERT INTO bitacora_tarifas(id,fecha) VALUES (0,NOW())

but anyways it does not work....

Someone can help me?