Java over HTTP: "System.err: error captured" text in output?

Hello,

I have a Java over HTTP recorded script. The script was recorded using Java Web Start. Everything seemed to record and compile. When I replay, no scipt errors are thrown but in the output log I see the text "System.err: error captured".

This java application recorded in the script prompts the user to login with a user name and password. After this login, a dashboard is displayed. The script replays but it does not seem this login process was successful.

Anyone have any insight as to what might be causing the "System.err: error captured" text in the output?

Here is the script excerpt that is throwing that error text:

RemoteInvocation RemoteInvocation_login31 = (RemoteInvocation) JavaHTTP.readObject(RemoteInvocationBA0);

    JavaHTTP.sendSerialized(RemoteInvocation_login31, 31,
    "ObjectsDeserializerDefaultImpl",
    "LoginService-httpinvoker",
    "URL=http://XYZ",
    new String[]{ 
        "Method=POST", 
        "Resource=0", 
        "RecContentType=application/x-java-serialized-object", 
        "Referer=", 
        "Mode=HTML", 
        "EncType=application/x-java-serialized-object", 
        LAST});// 31 is the number of the header file, couldn't decode response from body