How to generate custom query method

Hi,

I`m trying to add a EJB query method to a Entity Bean (for Table "Card"), 
that counts the number of cards.
I have added the following "code"
 /**
 * @ejb.select
 *    result-type-mapping="Local"
 *    query="SELECT COUNT(*) FROM Card,  WHERE State_Id = ?1"
 * 
**/
public abstract long countCards(long ErrorId);



in the file "cmp20-Card-class-comments.txt" within the merge directory. 
Midlegen copies this code into the CardBean.java file, but xdoclet then 
fails to execute (<<The Bean class is needed but not found in Xdoclet 
source path for interface com.gd.ecard.dao.interfaces.CardLocal>>)

What am I doing wrong?
I would be grateful for any help.
Thanks.