Getting error Objects of class org.apache.commons.httpclient.HttpClient cannot be serialized. (2,694

Getting error Objects of class org.apache.commons.httpclient.HttpClient cannot be serialized. (2,694), this use to work well before, but something is causing this. Any help is appreciated.

Following is my code

         Local object &client3 = CreateJavaObject("org.apache.commons.httpclient.HttpClient");

         Local object &postmethod3 = CreateJavaObject("org.apache.commons.httpclient.methods.PostMethod", &build_url);

         Local any &responseCode4 = &client3.executeMethod(&postmethod3);