I was trying to add my own WebService/asmx to SharePoint 2013.

and I got this wonderful error message

Sorry, something went wrong
An error occurred during the processing of /_layouts/MyFolder/MyWS.asmx. Could not create type 'MyNamespace.MyClassName'.

Technical Details

Troubleshoot issues with Microsoft SharePoint Foundation.

Correlation ID: 93a3de9c-2213-3030-a6c5-f324a2c11743

Date and Time: 1/11/2015 10:11:35 AM

BTW, it was working on SharePoint 2007 with the same method which I've also seen to be working here:

  1. I've compiled my WebService Against .Net 4.0 (AnyCpu) to get MSIL DLL file.
  2. Copied the files to SharePoint machine
  3. Installed to GAC by using this:

    C:\Program Files (x86)\Microsoft SDKs\Windows\v8.0A\bin\NETFX 4.0 Tools\x64\gacutil.exe -I MyDllName.dll

  4. Tested that the Dll were successfully installed by using this:

    C:\Program Files (x86)\Microsoft SDKs\Windows\v8.0A\bin\NETFX 4.0 Tools\x64\gacutil.exe -L MyDllName

  5. I've also tried to write text-only asmx to test the GAC:

    <%@ WebService language="C#" class="TestMyAssembly" %>

using System; using System.Reflection; using System.Web.Services; using System.Xml.Serialization; [WebService(Namespace = "http://test.com/Test")] public class TestMyAssembly : WebService { [WebMethod] public String TestAssembly() { Assembly assembly1 = Assembly.Load("FullAssemblyName1, Version=, Culture=neutral, PublicKeyToken=118db1178ce8ee11, processorArchitecture=MSIL"); Assembly assembly2 = Assembly.Load("FullAssemblyName2, Version=, Culture=neutral, PublicKeyToken=22e5225e223b2240, processorArchitecture=MSIL"); if (assembly1 != null && assembly2 != null) { return "No exception so far..."; } return "Something is wrong"; } }

Any help would be greatly appreciated. thanks!

1 Answer 1


It seems that the Project was broken in some way.

I've created new Web Project, copied all files to the new project, and all is working again.

Weirdest thing I've ever seen.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.