[Mono-list] Invalid IL code exception from web service call

[Andrus]

I tried my asmx web service in Mono 2.4
Web service call returns the following exception:

  <?xml version="1.0" encoding="utf-8" ?>
 <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
 <soap:Body>
 <soap:Fault>
  <faultcode>soap:Server</faultcode>
  <faultstring>Invalid IL code in (wrapper
runtime-invoke)MyApp.Service.StockService:runtime_invoke_string__this___UserCredentials&_string_List`1<FormField>_List`1<RidT>
(object,intptr,intptr,intptr): IL_002c: call 0x00000004</faultstring>
  </soap:Fault>
  </soap:Body>
  </soap:Envelope>

How to fix ?

Andrus.