Thank you Amit,

  I am using J# and covert several Java Class to DLL with jbimp

  The error occurs while calling the object CParameter.

  The DLL in question is referenced in my solution. This occurs with most
java classes converted by jbimp

  Looking at the object browser the class CParameter is public.

  I use command jbimp *.class /usestubrefs /t:library

Thank you

Bob

package ap_web;

import webapi.common.CPage;
import webapi.common.CCommException;
import webapi.common.CParameter;
import webapi.common.CDGroup;
import webapi.common.CServer;
import webapi.common.CKey;
import webapi.common.CDoc;
import webapi.common.CLicInfo;
import System.Collections.*;
import System.ComponentModel.*;
import System.Data.*;
import System.Drawing.*;
import System.Web.*;
import System.Web.SessionState.*;
import System.Web.UI.*;
import System.Web.UI.WebControls.*;
import System.Web.UI.HtmlControls.*;

....

    private void Button1_Click (Object sender, System.EventArgs e)
    {
        try
        {
               
            //Create Parameter object and set the License String
            CParameter oParameters= new CParameter("KAaOlISpP7vnnQDeFipx9U4");

                               ... more code

        }
        catch
        {
            ... blah blah
        }
    }