SerializationEx ception in Web Service

[billa]

Hello,

I am creating a web service with .NET 2.0 and Visual Studio 2005.
I want to enable the following class as a web service:
[WebService(Name space = "http://webservice.docu ware.com/")]
[WebServiceBindi ng(ConformsTo = WsiProfiles.Bas icProfile1_1)]
public class Service : System.Web.Serv ices.WebService
{

[WebMethod]
public string GetStoreDate(st ring fcGUID, long dwdocid)
{
string date = <do something in an external application and
return a string>;

return date;
}
}
When I now test the GetStoreDate Web Service it actually does
everything right. The debugger shows the correct value for the date
variable. However after leaving the method I get the following
exception:

System.Runtime. Serialization.S erializationExc eption was unhandled
Message="Type is not resolved for member
'DocuWare.Commo n.Logging.Loggi ngContextData,D ocuWare.Common,
Version=5.1.0.2 65, Culture=neutral , PublicKeyToken= 879da714589ba9e a'."
Source="WebDev. WebHost"
StackTrace:
at Microsoft.Visua lStudio.WebHost .Host.ProcessRe quest(Connectio n
conn)
at Microsoft.Visua lStudio.WebHost .Server.OnSocke tAccept(Object
acceptedSocket)
at
System.Threadin g._ThreadPoolWa itCallback.Wait Callback_Contex t(Object
state)
at System.Threadin g.ExecutionCont ext.Run(Executi onContext
executionContex t, ContextCallback callback, Object state)
at
System.Threadin g._ThreadPoolWa itCallback.Perf ormWaitCallback (Object
state)
The requested DLL "DocuWare.Commo n" is referenced in the Web Project
and I also use it in the class:
using DocuWare.Common .Logging;

I am actually not using any classes or methods from the DLL in my
webservice. However it is possible that the some method down the line
from <do something in an external application and return a string> uses
a method of the DLL.

Why am I getting this exception? How can I avoid it?

Thanks for your help.

billa