Sorry, we have some technical problems. If you get this error, please inform us.
http://support.thomsonhighered.com/tech_support_form.html

The exception occurred on the web interface tier.

java.lang.NumberFormatException: null at java.lang.Long.parseLong(Long.java:372) at java.lang.Long.(Long.java:671) at com.thomsonhighereducation.actions.client.product.ProductAction.viewleadTeacher(ProductAction.java:711) at sun.reflect.GeneratedMethodAccessor2089.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:274) at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:194) at org.apache.struts.actions.MappingDispatchAction.execute(MappingDispatchAction.java:169) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224) at com.thomsonhighereducation.actions.MyRequestProcessor.process(MyRequestProcessor.java:36) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) at javax.servlet.http.HttpServlet.service(HttpServlet.java:743) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:175) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3231) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2002) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1908) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1362) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209) at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)