Load Runner .Net - Found an undefined object of type

Hi

I am trying to record a .net thick client application in Load Runner 12.01 but i am getting the following errors. can someone please help

namespace Script {
    using LoadRunner;
    using Mercury.LoadRunner.DotNetProtocol.Replay;
    using OM.EXIGO.SGUI;
    using OM.EXIGO.SGUI.WscServicesAPI;
    using OM.EXIGO.SGUI.WsCUsersAndRolesAPI;
    using Script.Accessors;
    using System;
    using System.Data;
    using System.Net;
   
   
    public partial class VuserClass {
       
        public virtual int Action() {

            lr.think_time(11);

            lr.log("Event 1: new NetworkCredential();");
            NetworkCredential_1 = new NetworkCredential();

            lr.log("Event 2: NetworkCredential_1.UserName = \"NEWUSERT1\";");
            NetworkCredential_1.UserName = "CITI20T1";

            lr.log("Event 3: NetworkCredential_1.Password = \"passowrd1234\";");
            NetworkCredential_1.Password = "passowrd1234";

            lr.log("Event 4: new AssemblyWithVersionDS();");
            AssemblyWithVersionDS_1 = new AssemblyWithVersionDS();

            lr.log("Event 5: AssemblyWithVersionDS_1.AssemblyWithVersionDT;");
            AssemblyWithVersionDTDataTable_1 = AssemblyWithVersionDS_1.AssemblyWithVersionDT;
            // Table AssemblyWithVersionDTDataTable_1 is empty

            lr.log("Event 6: AssemblyWithVersionDTDataTable_1.AddAssemblyWithVersionDTRow(\"OM.EXIGO.d" +
              "ll\", \"2.7.1.1498\");");
            AssemblyWithVersionDTRow_1 = AssemblyWithVersionDTDataTable_1.AddAssemblyWithVersionDTRow("OM.EXIGO.dll", "2.7.1.1498");

            lr.log("Event 7: NetworkCredential_1.UserName;");
            StringRetVal = NetworkCredential_1.UserName;

            #warning:  Code Generation Error
            // Found an undefined object of type System.Xml.XmlTextWriter. Assigning it the name writer_1.
            // Suggested solution: adding both this type, in assembly System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, to the filter
            // and/or any other types that return instances of this one.
            // Note:  This script will not compile as is.
            lr.log("Event 8: new DataSet_Accessor(AssemblyWithVersionDS_1).WriteXml(writer_1);");
            new DataSet_Accessor(AssemblyWithVersionDS_1).WriteXml(writer_1);

            #warning:  Code Generation Warning
            // Note:  writer_1 is not included in the recording filter.
            // Its state may have changed since it was last detected.
            #warning:  Code Generation Error
            // Found an undefined object of type OM.EXIGO.SGUI.WscServicesAPI.AssemblyWithVersionDS. Assigning it the name AssemblyWithVersionDS_2.
            // Suggested solution: adding both this type, in assembly SGUIWebReferences, Version=2.7.1.0, Culture=neutral, PublicKeyToken=8941f02d31442b70, to the filter
            // and/or any other types that return instances of this one.
            // Note:  This script will not compile as is.
            lr.log("Event 9: new DataSet_Accessor(AssemblyWithVersionDS_2).WriteXml(writer_1);");
            new DataSet_Accessor(AssemblyWithVersionDS_2).WriteXml(writer_1);

            lr.log("Event 10: NetworkCredential_1.GetCredential(new Uri(\"https://testdomain.com/HEXAPIRelease5/SGServiceA/CServicesAPI.asmx\"), \"digest\");");
            NetworkCredential_1 = NetworkCredential_1.GetCredential(new Uri("https://testdomain.com/HEXAPIRelease5/SGServiceA/CServicesAPI.asmx"), "digest");

            lr.log("Event 11: NetworkCredential_1.GetCredential(new Uri(\"https://testdomain.com/HEXAPIRelease5/SGServiceA/CServicesAPI.asmx\"), \"basic\");");
            NetworkCredential_1 = NetworkCredential_1.GetCredential(new Uri("https://testdomain.com/HEXAPIRelease5/SGServiceA/CServicesAPI.asmx"), "basic");

            lr.log("Event 12: new AssemblyWithVersionDS();");
            AssemblyWithVersionDS_3 = new AssemblyWithVersionDS();

            #warning:  Code Generation Error
            // Found an undefined object of type System.Xml.XmlTextReader. Assigning it the name reader_1.
            // Suggested solution: adding both this type, in assembly System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, to the filter
            // and/or any other types that return instances of this one.
            // Note:  This script will not compile as is.
            lr.log("Event 13: new DataSet_Accessor(AssemblyWithVersionDS_3).ReadXml(reader_1);");
            new DataSet_Accessor(AssemblyWithVersionDS_3).ReadXml(reader_1);

Here are the missing libraries that Load runner is complaining during compilation.

            // Found an undefined object of type System.Xml.XmlTextWriter. Assigning it the name writer_1.

            // Found an undefined object of type OM.EXIGO.SGUI.WscServicesAPI.AssemblyWithVersionDS. Assigning it the name AssemblyWithVersionDS_2.

            // Found an undefined object of type System.Xml.XmlTextReader. Assigning it the name reader_1.

How can i resolve these errors?

Thanks
Sri