Problem h:SelectManyCHeckbox --Conversion error occured

Need urgent help ,Causing a lot of trouble
error--
com.sun.faces.context.FacesContextImpl addMessage Adding Message[sourceId=formUserSetup:chkboxUserPrfRoles,summary=Conversion error occurred)
Displays the form fields depending on the selected value on the select one list box.select many check boxes displays the values of the check boxes for the selected user.Everything is working fine for the first display
For the secong selection its throwing an error.
code:
onchange:
f = document.getElementById("formUserSetup");
f.submit();

Thank u,
yes ,value in the select one list box is ties toa string .Depending on the slected string i am generating a information bean that displays and binds to the form.
I n this form i have got a select many checkbox control that displays
--all the roles in table
--and the value will have roles belonging to a selected user from the list box control
In this process when i switch b/w the users there is a conversion error

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Conversion Error of SelectManyCheckBox

Hi @ all,
I need your help urgently!
I want to realize two SelectManyCheckBox, each of them has a valueChangeListener. When user change the current state of the check boxes, some actions are performed.
The problem now is when one check box is clicked(a valueChangeListener is called), then a conversion error message is shown out, which says there is a conversion error occured at the other SelectManyCheckBox component.
I tried several times and found, only if the presious state of the check box component is empty, such conversion error occurs.
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thanks for your reply, but i think my problem is not what you meant.
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Message was edited by:
        Xiaoming Yang

Hello Experts,
Any replies on this?
I am also getting a similar kind of error.
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