Websphere liberty IBM error 500

I have a problem, to implement a custom 500 error screen, from a server Websphere liberty IBM v17.0.0.4.

In the web.xml file I used the following configuration:

 <error-page>
         <error-code>500</error-code>
        <location>/errores/error_500.xhtml</location>
    </error-page>

<error-page>
    <exception-type>java.lang.Exception</exception-type>
    <location>/errores/error_500.xhtml</location>
</error-page>

However, this still does not show the error screen, someone knows if it should be configured any part of the server.

Thank you ...