Hello World Scriptlet Example:Error "cannot be resolved to a type"

I am trying to follow the tutorial Hello World Scriptlet Example by Sadakar Pochampalli.

After following all the instructions, once i try to compile and run the report i get the error below.

Help greatly appreciated!!

    _{net.sf.jasperreports.engine.JRException: Errors were encountered when compiling report expressions class file:
    1. com.sadakar.jasper.Test4 cannot be resolved to a type
                value = ((com.sadakar.jasper.Test4)parameter_Hello_SCRIPTLET.getValue()).hello(); //$JR_EXPR_ID=8$
                          <---------------------->
    2. com.sadakar.jasper.Test4 cannot be resolved to a type
                value = ((com.sadakar.jasper.Test4)parameter_Hello_SCRIPTLET.getValue()).hello(); //$JR_EXPR_ID=8$
                          <---------------------->
    3. com.sadakar.jasper.Test4 cannot be resolved to a type
                value = ((com.sadakar.jasper.Test4)parameter_Hello_SCRIPTLET.getValue()).hello(); //$JR_EXPR_ID=8$
                         <---------------------->
    3 errors
        at net.sf.jasperreports.engine.design.JRAbstractCompiler.compileReport(JRAbstractCompiler.java:206)
        at net.sf.jasperreports.eclipse.builder.JasperReportCompiler.compileReport(JasperReportCompiler.java:294)
        at com.jaspersoft.studio.editor.preview.view.control.ReportControler.compileJasperDesign(ReportControler.java:465)
        at com.jaspersoft.studio.editor.preview.view.control.ReportControler.access$15(ReportControler.java:442)
        at com.jaspersoft.studio.editor.preview.view.control.ReportControler$5.run(ReportControler.java:356)
        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)}