[texhax] Natbib problem

[Mostafa ali]

Hi 

I am a new user to the Tex system. I wrote my thesis using havard package 
refrence style, but now I want to use natbib package. So I put 
\usepackage{natbib}, used \bibliographystyle{plainnat} and also changed cite to 
\citet{}. But don't know why I am getting this following error message. 


! undefined control sequence
1.5 \havartcite
                {chaudhry08}{}{}{}
 
 
I thought that it would be simple. Now I don't have any idea what's I am doing 
wrong. Any help would be appreciable.

Thanks.

Mostafa


      
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