APEX

Hello

I just installed Oracle Apex 2.2.1 as per the installation guide.
Version Details :
select * from v$version
BANNER
Oracle9i Enterprise Edition Release 9.2.0.6.0 - 64bit Production
PL/SQL Release 9.2.0.6.0 - Production
CORE 9.2.0.6.0 Production
TNS for HPUX: Version 9.2.0.6.0 - Production
NLSRTL Version 9.2.0.6.0 - Production

On the web server side:
Oracle HTTP Server 10.1.2.0.0

I also installed the pl/sql owa webtoolkit provided as part of the installation.
I ran the following before and after installtion of the web toolkit :

select owa_util.get_version from dual
GET_VERSION
3.0.0.0.4

After starting the Apache server, I could access the Apex Administration link and work on it as normal.

However when I am trying to access the Developer link, I am able to see the login page, but when I try to login I get the following error :

http://eoa-bowbp:7777/pls/apexnq/wwv_flow.accept
The page cannot be found

The apache log error has the following entry :
[Mon Jul 09 11:50:10 2007] [error] [client 172.21.52.86] [ecid: 1183999810:172.21.252.117:5780:5880:236,0] mod_plsql: /pls/apexnq/wwv_flow.accept HTTP-404 ORA-06502: PL/SQL: numeric or value error\nORA-06512: at line 55\n

Please advise on what can be done to resolve this.
Thanks in advance.

Vivek