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xml error when returning null in my Action.

 
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say I just received a parameter from a javascript into an action; and I would like to 'stick' this parameter to one of the form's fields.

In the code below I managed to get the fare's value but couldn't bring it back to the form's field (fare).
I get the following error:



this is the action


this is the referral from the jsp page (javascript)



thanks
 
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