'CustomErrors' tag should then have its "mode" attribute set to "Off".
29 Oct 2011
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".
pl see attach doc file for details
How i can solve this error
Thank in Adv