Oracle Application Express release 4.2 requires an Oracle database (Enterprise Edition, Standard Edition or Standard Edition One) that is Release 10.2.0.4 or higher. Oracle Application Express 4.2 can also be used with Oracle Database Express Edition 10g Release 2 and later.
Not to state the obvious, but that is REALLY old. Extended support ended on July 2010. Although they technically have "lifetime" support, you are several versions behind.