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I was having this same problem after having created a demo application that displays a
graph of the employee salary data using Oracle's XE built-in HR database.
I am using Jdeveloper 188.8.131.52.0.
After some experimenting, I found I could eliminate the error by changing the setting of
CacheResults in the Iterator from the default <true> to false. Granted, this will affect performance, but
it is a work-around. I think that the error is that the data from element is not being stored anywhere for
the graph element to pick up (this may be due to partial-page rendering (ppr), but I am not sure.)
Open your .jspx file in the editor. Select the graph component. Click on the Bindings tab at the bottom.
You should see a binding between a graph component (under Bindings) to an Iterator (Executable) to
a Data Control element.
Click on the Iterator, and under Advanced, set the CacheResults to false and rerun the application.
Hope this helps.