How to avoid runtime error pages in asp.net application?

Question

If somke error occurs i want the system to redirect to some other page and not show he error message.

<customErrors
   mode="RemoteOnly" 
   defaultRedirect="~/Error.aspx" />

This is not working.

Answer 1

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

Note: use capital O on Off

Another idea:
This error can be caused by a virtual directory not being configured as an application in IIS.
And if the server is remote (and it probably is) then perhaps you have this line:
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<authentication mode="Windows" /> 

if so, you might be blocked by the server with Windows Authentication, you might want to remove that line...