Could not load the assembly 'App_Web_kh7-x3ka'. Make sure that it is compiled before accessing the page

Question

I can't seem to figure out what I am doing wrong here. I publish my website to my server and when I try to run it I get the following exception:

Could not load the assembly 'App_Web_kh7-x3ka'. Make sure that it is compiled before accessing the page.

Has anyone else ever encountered this?

Answer 1

This can also happen when you've taken a pre-compiled aspx page and edited it as if uncompiled, such as copying it from the Live server and overwriting your dev/working version.

On the first line of your aspx page within the <%@Page /> tag you'll probably see an attribute like:

inherits="yourPageClass, App_Web_kh7-x3ka".

Delete the "App_Web_XXXX" part and add the CodeFile attribute pointing to your code behind file:

CodeFile="yourPageFile.aspx.cs"

The <%@Page /> tag should now look similar to when you create a new page from scratch.

When your Asp.Net pages are precompiled for release to the production server, references to the code behind are replaced with references to the compiled DLLs which have the App_Web_XXXX name.

Answer 2

A quick google for "Make sure that it is compiled before accessing the page."

led me to the following

http://www.velocityreviews.com/forums/t301533-could-not-load-assembly-make-sure-that-it-is-compiled-before-accessing-the-page.html

And the problem might be as described that the application pool / website is not set to the correct version of .NET

The following question has another solution as the last reply http://forums.asp.net/t/1131537.aspx

From the looks up it it would seem your webserver is not properly configured, or that you are refering to a nonexistant/old dll