Update web.config

Author: CloudBreadPaPa

web.config

@@ -68,6 +68,7 @@
   </appSettings>
   <system.web>
     <httpRuntime targetFramework="4.5" />
+    <customErrors mode="Off" /><!-- in release mode, block this dev mode setting -->
     <compilation debug="true" targetFramework="4.5" />
   </system.web>
   <system.webServer>
@@ -122,4 +123,4 @@
       <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
     </providers>
   </entityFramework>
-</configuration>
+</configuration>