facing problem to upload file on server

Question

when i am trying to store file in my server following error message comming--

 

 

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>