Maybe you also already got the 404 Not Found error message
The requested URL /pls/apex/wwv_flow.accept was not found on this server.
when you submit an Oracle APEX page, …
There are a lot of reasons why this error can occur. But the above error message doesn’t tell you a lot about the root cause of the problem. The real error message can be found on your Apache Web server in the Apache\Apache\logs\error_log.xxxxx file. There you will find and entry like