Web Service ErrorL

[Natalie Lewis]

I'm not sure if this is a SharePoint, InfoPath or Web Service issue. I have
created a web service generate a unique ID for an InfoPath form. Everything
works great when its on my local machine. I installed the web service into
our SharePoint 2007 environment and webservice and WSDL files are accessible
from IE, however when I attempt to add the Web Service as a data connection
to the InfoPath form, the web service connects and the operations list
appears and then I receive an error: Infopath was unable to create a schema
from the results of the Web service call.

The SOAP response indicates that an error occurred on the server:

Server was unable to process request. ---> Value cannot be null.
Parameter name: path

I am pretty convinced it's a permissions error, but I'm not sure what
additional permissions are needed on the SharePoint server to get this
working. Any help is appreciated!

Thanks

 

[David Dean]

I assume the exception is occurring in one of the calls being made inside the
web service. Since the "Value cannot be null" exception is occurring on a
parameter named "path", I wonder if maybe you're missing a configuration
entry...?

Also, what steps did you use to install and configure the web service on the
SharePoint server? Depending on how you deployed the web service, you may
need to add configuration entries to a different web.config file. If you
think it's a permissions issue, check the web.config for the folder that
contains the .asmx file to make sure you've enabled impersonation and Windows
authentication and added all of the necessary configuration items.

Here's a way you can debug this on the SharePoint server:
- Make sure you have compiled your web service in Debug mode; if not,
recompile it and redeploy it to the server.
- Install and configure the Visual Studio 2005 Remote Debugger on the
SharePoint box using the VS2005 setup CD/DVD, then start the remote debugger
module.
- Open your web service project in Visual Studio and select Debug >
Attach... from the menu.
- Enter the machine name of the SharePoint server; you should get a list of
the processes running on the server.
- Ctrl-click all of the w3wp.exe processes and click the Attach button.
- Add a breakpoint at the beginning of your web service method.
- Try to add the web service connection to InfoPath; Visual Studio should
break into the debugger when InfoPath tries to execute the web service method.

You should now be able to single-step through your code to find the problem.