Fatal error: Call to a member function link() on a non-object in

hello all, 

     i am very new to cake php, hardly 2-3 days , i stated working on project.

     i am facing a error i.e

    Fatal error: Call to a member function link() on a non-object in

    line "

    app/views/layout/default.ctp 

    <?php

        echo $javascript->link(array(FV_JS . "jquery-1.7.1.min.js?v=" . VERSION_NUMBER));

    ?>

   i have searched a lot but unable to solved this problem 

    please share you reply, if any file u want to see, please tell     

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