Calling from ASP.NET running inside XSP2

The same code works from a console app, but if I try to use it inside a .aspx page, the XSP2 web server exits with:

  at NDesk.DBus.Signature.GetSig (System.Type) <0x00342>
  at NDesk.DBus.TypeImplementer.GenHookupMethod (System.Reflection.Emit.ILGenerator,System.Reflection.MethodInfo,System.Reflection.MethodInfo,string,string) <0x0094f>
  at NDesk.DBus.TypeImplementer.Implement (System.Reflection.Emit.TypeBuilder,System.Type) <0x00204>
  at NDesk.DBus.TypeImplementer.GetImplementation (System.Type) <0x0008d>
  at NDesk.DBus.BusObject.GetObject (NDesk.DBus.Connection,string,NDesk.DBus.ObjectPath,System.Type) <0x00012>
  at NDesk.DBus.Connection.GetObject (System.Type,string,NDesk.DBus.ObjectPath) <0x0002a>
  at NDesk.DBus.Connection.GetObject<object> (string,NDesk.DBus.ObjectPath) <0x00026>
  at Test.Standalone.CLI.Proxy.CLIProxy.Commit (Test.Shared.Configuration) <0x0003a>
  at Test.Standalone.Service.Service.Commit (string,Test.Enterprise.DataTypes.Device) <0x00077>
  at (wrapper runtime-invoke) Test.Standalone.Service.Service.runtime_invoke_object__this___object_object (object,intptr,intptr,intptr) <0xffffffff>
  at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke (object,object[],System.Exception&) <0x00004>
  at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke (object,object[],System.Exception&) <0xffffffff>
  at System.Reflection.MonoMethod.Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) <0x0009e>
  at System.Reflection.MethodBase.Invoke (object,object[]) <0x00022>
  at System.Web.Services.Protocols.LogicalMethodInfo.Invoke (object,object[]) <0x0006f>
  at System.Web.Services.Protocols.HttpSoapWebServiceHandler.Invoke (System.Web.HttpContext,System.Web.Services.Protocols.SoapServerMessage) <0x00110>
  at System.Web.Services.Protocols.HttpSoapWebServiceHandler.ProcessRequest (System.Web.HttpContext) <0x00128>
  at System.Web.HttpApplication/<Pipeline>c__Iterator2.MoveNext () <0x02825>
  at System.Web.HttpApplication.Tick () <0x0002e>
  at System.Web.HttpApplication.Start (object) <0x001a4>
  at System.Web.HttpApplication.System.Web.IHttpHandler.ProcessRequest (System.Web.HttpContext) <0x00032>
  at System.Web.HttpRuntime.Process (System.Web.HttpWorkerRequest) <0x001fc>
  at System.Web.HttpRuntime.RealProcessRequest (object) <0x00050>
  at System.Web.HttpRuntime.ProcessRequest (System.Web.HttpWorkerRequest) <0x0003f>
  at Mono.WebServer.MonoWorkerRequest.ProcessRequest () <0x00087>
  at Mono.WebServer.BaseApplicationHost.ProcessRequest (Mono.WebServer.MonoWorkerRequest) <0x00088>
  at Mono.WebServer.XSPApplicationHost.ProcessRequest (int,long,int,long,int,string,string,string,string,byte[],string,intptr,Mono.WebServer.SslInformations) <0x0035a>
  at (wrapper remoting-invoke-with-check) Mono.WebServer.XSPApplicationHost.ProcessRequest (int,long,int,long,int,string,string,string,string,byte[],string,intptr,Mono.WebServer.SslInformations) <0xffffffff>
  at (wrapper xdomain-dispatch) Mono.WebServer.XSPApplicationHost.ProcessRequest (object,byte[]&,byte[]&,int,long,int,long,int,string,string,string,string,byte[],string) <0xffffffff>
  at (wrapper xdomain-invoke) Mono.WebServer.XSPApplicationHost.ProcessRequest (int,long,int,long,int,string,string,string,string,byte[],string,intptr,Mono.WebServer.SslInformations) <0xffffffff>
  at (wrapper remoting-invoke-with-check) Mono.WebServer.XSPApplicationHost.ProcessRequest (int,long,int,long,int,string,string,string,string,byte[],string,intptr,Mono.WebServer.SslInformations) <0xffffffff>
  at Mono.WebServer.XSPWorker.RunInternal (object) <0x005ca>
  at (wrapper runtime-invoke) object.runtime_invoke_void__this___object (object,intptr,intptr,intptr) <0xffffffff>

Native stacktrace:

        /usr/local/bin/mono [0x80cb6d9]
        /usr/local/bin/mono [0x80f57f1]