Oracle Trigger errors
you just need add Colon character (:) before new keyword same as below query:

create or replace TRIGGER TRG_ENV_CONFIG_INSERT
AFTER INSERT
  ON ENV_CONFIG
  FOR EACH ROW 
BEGIN
  INSERT INTO ENV_CONFIG_HIST (
    PARAM_NAME
    ,PARAM_DESCR
    ,PARAM_VALUE
  ) VALUES (
    :new.PARAM_NAME
   ,:new.PARAM_DESCR
   ,:new.PARAM_VALUE
 );
END;