How to set web.config file to show full error message

not sure if it'll work in your scenario, but try adding the following to your web.config under <system.web>:

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

works in my instance.

also see:

c# asp.net asp.net-mvc-3 web-config

This can also help you by showing full details of the error on a client's browser.

<system.web>    <customErrors mode="Off"/></system.web><system.webServer>    <httpErrors errorMode="Detailed" /></system.webServer>

c# asp.net asp.net-mvc-3 web-config

If you're using ASP.NET MVC you might also need to remove the HandleErrorAttribute from the Global.asax.cs file:

public static void RegisterGlobalFilters(GlobalFilterCollection filters){    filters.Add(new HandleErrorAttribute());}

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