I am having the same exact problem! I downloaded the source and added the projects to my solution. Then in my already existing Web Application, under my "Members" folder I created "Forum" and imported all the existing items from the "YetAnotherForum.NET" website project.

The problem is with the items in the App_Code directory. I tried adding the App_Code directory with its items to my Web Application and also I tried taking just the "YAF" folder out of App_Code and adding it to the root of my web app. Both of which throw these 4 errors.

Any suggestions? I'm stuck!

Can any of the pros weigh in on this?

My work around is to copy all the YAF files to the appropriate places within my project folder and then publish by doing "Copy Everything from Solution Folder". So it works, but I can't work with any of the YAF stuff within my solution in Visual Studio. I can't add YAF as a project to my solution without getting these errors, if I'm explaining it clearly.

I'd love to be able to add it as a project and work with everything within one solution, which sounds like what these guys are trying to do too. Are we doing something wrong?

UPDATE:

Ok, I've got it compile..

This is what I have done:

.) Created a new WebApp Project and a Class Library Project, added the Files from the YAF Website Project to the Webapp (except the App_Code folder wich goes into the Class Library Project).
.) Added all needed references to the Library to get it compiled.
.) Updated all web.config entries referencing System.Web.Extensions (even the 3.5 config has references to 1.xx of the assemblies, so you will need to update no matter what config you use).<- That was causing the exception, it tried to load the 1.xx ajax assembly.. (I'm stupid i know )
Just leave the entries and add:

Code:

    <runtime>
      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
        <dependentAssembly>
          <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/>
          <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>
        </dependentAssembly>
        <dependentAssembly>
          <assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/>
          <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>
        </dependentAssembly>
      </assemblyBinding>
    </runtime>

.. works like a charm
.) Update the web.config control entries to use the assembly created by the Class Library:
<add tagPrefix="YAF" namespace="YAF" assembly="YourClassLibrary"/>
<add tagPrefix="editor" namespace="YAF.Editor" assembly="YourClassLibrary"/>
.) The last step was to convert the thing to a WebApplication so all pages get updated to use the ClassLibrary.

After doing these steps everything complies fine, but here comes the next problem... when i run the app i get an "file not found" exception when it tires to load the the forum.ascx control.

This is where I am stuck right now...

Any ideas?

Has anybody come to find a solution to this issue? I am experiencing the same problem and have, like everyone else above, run out of options and time. Here's hoping this post will bring this thread/issue back to life.

So, maybe I've got it working now.
I just need to verify that it is actually working and then figure out exactly what made the trick.
Be right back with some more comments.

... Here it goes.
The short version is that I changed the Build Action of the Forum.cs file (in the App_Code/YAF folder) from Build to Content
But I now realize that my problem wasn't a "file not found" exception as described in a earlier post in this thread, so this trick might not help you.

Longer Version.
*Using Visual Studio 2008 v. 9.0.30729.1 SP, .Net Framework 3.5 SP1
*Downloaded YAF-v1.9.3-RC2-SRC. Opened up the yetanotherforum.net.vs2008.sln and converted it.
*Used the Recommended.NET3.5web.config.
*Changed all projects to build with the .NET 3.5 framework.
*Changed to Release mode and build solution.

(*Notes to myself: Copy all the dll:s (YAF.XXX.dll, Intelligencia.UrlRewriter.dll, CookComputing.XmlRpcV2.dll) to a "ThirdPartyComponents-" folder in my existing web app solution. I kind of like it organized that way.)
*copy all the contents of the YetAnotherForum.NET Web SITE project to a sub-folder (in my case "yaf" ) within my existing Web APPLICATION.
*Edit and organize the .config files (as described elsewhere in this forum).
*Move the App_Code folder to your root directory.
*Add references (for your Web Application) to all of the 7 YAF.XXX.dll, Intelligencia.UrlRewriter.dll, CookComputing.XmlRpcV2.dll (and if not allready exist also AjaxControlToolkit, System.Web.Extensions and System.Web.Extensions.Design)
*Right click your Web App and select "Convert To Web Application". (Note: The studio altered the folder name App_Code to Old_App_Code while converting. Rename back to App_Code).
*Alter the Build Action from Compile to Content of the forum.cs file (probably all .cs files in App_Code)
*Build your solution and run your web application.

If you want the whole YAF source code in your solution you could probably add all the projects to your solution and then have your web app referencing the projects and not the dll:s as described above. In that case you probably also want YAF projects reference each other by project and not by dll (sorry about the poor choice of datalinguish here but)