@jared-wiltshire URL is shown below:

If I click "Users" menu link, it comes out some other errors:

I have used some other browsers but get the same result...

I am not very sure the meaning of "errors in my ma.log file", How can I check it?
Furthermore, I don't think it is a new installation, because I just installed Mango for only one time. But I did follow the tutorial video which guides me to copy all the installed files in to C:\Program Files\Mango Automation\bin, so that to use cmd to start Mango.

@craigweb Hi, The version of Mango is 3.4.4.
When I successfully use cmd to open mango web in Google Chrome, but when its loading, a warning occurs:

Despite warning, I can still reach to the login page, and use "admin" as the initial account and password. The problem is, when I finished the login, the web page would then launch the "Page not Found" error:

Well, I am a new user of Mango. Through the installation video, all things are installed. However, when I use "admin" as the username and password to login into the web, an error of "Page not found" occurs on the web page. How to fix it?