jde - Windows cannot find 'C:\E812\system\oc4j\startOC4J.bat'

Question

I am using JD Edwards EnterpriseOne 8.12 DEMO When I click JDEdwards Solution Explorer » Tools » EnterpriseOne Menu, I get the following errors

ERROR 1

Windows cannot find 'C:\E812\system\oc4j\startOC4J.bat'. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.

When I pressed 'OK', a small pop window with title 'Starting Web Server' and a progress bar has came. After the this windows, I got the following errors

ERROR 2
Could not start Web Server

ERROR 3
Failed to Launch E1 Menu on HTML Engine

How can I fix the issue ?