Excel File Downloading From Server this time error Occurred

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

this issue in the local machine not occurred but in the server, this issue occurred.

plz, help me.

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

<configuration>
<system.web>
<customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
system.web>
configuration>