IIS Could not load file or assembly 'App_Web_..., Version=0.0.0.0

Message

Could not load file or assembly 'App_Web_..., Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.

Context

Opening an ASP.NET page on a IIS web server.

Explanation

An unhandled exception occurred during the execution of the current web request. Precisely a System.IO.FileNotFoundException. This error may happen when the website is trying to load a custom web control that is displayed as needed. When the framework try to compile it, appends a random string at the end of the assemby. If another control referes to this one, at compile time the name of the newly compiled file and the previous version of the file cause a file name mismatch and therefore the parent control is looking for a file that no longer exists.

Solution

Setting the batch property of the compilation tag to false in the web.config file:

<compilation debug="false" batch="false" />

Internet Explorer cannot display the webpage

Message

There is a problem with this website's security certificate. Continue to this website (not recommended). Then when clicking on "Continue to this website" the site is redirected to res://ieframe.dll/ and displays the page: "Internet Explorer cannot display the webpage".


Context

Windows XP with IE7 or IE8

Explanation
This is an security setting issue of Active Scripting to be disabled. By default res://ieframe.dll/ (about:internet) isn't in any of the Security Zones defined, so it is handled by the Internet zone. And by default active scripting for that zone is disabled and ie7 (or ie8) doesn't continue to go to the website.

Solution
Add res://ieframe.dll/ to the trusted sites or local intranet.