webhotel og web.config

Hej Eksperter
Jeg har lavet nogle små aspx-sider i web matrix og de virker også fint når jeg kører dem på min egen pc. Men hvis jeg prøver at uploade dem til mit webhotel får jeg følgende fejl:

Runtime Error
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".


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

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

Derfor har jeg forsøgt at lave en web.config fil, hvor jeg har sat <customErrors mode="Off"/> men jeg får stadig samme fejl. Skal web.config ligge et bestemt sted eller??

Eller skal jeg uploade andet end bare aspx filerne??