The page cannot be displayed because an internal server error has occurred.

Hello.

How I get displayed custum error when i have in my script any sintax problem?

Now i get : The page cannot be displayed because an internal server error has occurred.

web.config

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <httpErrors errorMode="DetailedLocalOnly" />
    </system.webServer>
</configuration>