How can I resolve the following error? [on hold]

I am noob in web developing. I cant publish anything i get following error. " Notice: Undefined variable: td in /home/zyro/public_html/modules/builder/WB_Form.class.php on line 146

Fatal error: Call to a member function setAttribute() on a non-object in /home/zyro/public_html/modules/builder/WB_Form.class.php on line 146"

can anyone explain step by step to solve this problem?