I solved the problem by checking for nulls in the extended 
treeitemrenderer class.  I am confused why the check for nulls wasn't 
needed in Flex builder but was necessary when the code was compiled 
and moved to the server.

--- In flexcoders@yahoogroups.com, "arieljake" <[EMAIL PROTECTED]> wrote:
>
> I think this is happening because you are trying to access a 
property 
> or method of a null object reference.
> 
> :) I couldn't help myself.
> 
> But really, if this is happening after a deploy, maybe one of your 
web 
> service calls or server data calls are failing and in your code you 
are 
> not checking for valid data before operating on it. Make sure the 
paths 
> you are using work on the server too, and if your data calls are to 
web 
> pages that can be viewed in a browser directly, use a browser to 
view 
> them to make sure there are no errors preventing valid data from 
being 
> returned in the production environment.
> 
> --- In flexcoders@yahoogroups.com, "sarah_e_boys" <sarah_e_boys@> 
> wrote:
> >
> > I get the following error when I deploy and access my Flex app on 
a 
> web 
> > server.  Can anyone help?
> > 
> > TypeError: Error #1009: Cannot access a property or method of a 
null 
> > object reference.
> >     at samples::MyTreeItemRenderer/set data()
> >
>


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