ASP.net <customErrors mode

Hi
In my ASP.net web app I get the following message after publishing.
I get that I have to change my web.config file but do I have to also add
a web page called mycustompage.htm? Do I just add this to my project folder?
Can I fir example change the name to MyErrors.html?
Thanks

<!-- Web.Config Configuration File -->

<configuration>
    <system.web>
        <customErrors mode="Off"/>
    </system.web>
</configuration>
  

Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.



<!-- Web.Config Configuration File -->

<configuration>
    <system.web>
        <customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
    </system.web>
</configuration>
 

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