Funciona en el localhost, pero no en un servidor

[eduvivi]

Tengo una pequeña aplicacion web hecha en VB.NET, con una pagina prueba.aspx, esta tiene un formulario el cual tiene los controles de validación.
Funciona perfecto en el LocalHost, pero cuando subo la pagina a mi servidor me salta este error

Server Error in '/' Application.
--------------------------------------------------------------------------------

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>

Gracias de antemano