Task flow with a database not working

Hi everyone,
I created a task flow (ADF fusion web application) with a very simple database and a pie chart. When I deploy it and integrate it to my WebCenter portal application, I can see it clearly in my jspx page in the Design view. But when I try to run it, I can't see it on my Web Page OR I have this error message:
http://s17.postimage.org/4ne8fouwf/Sans_titre.png
Thanks for your help!

I know, in fact, I did my task flow with the same steps you do yours in your tutorial on taskflow, but I used a pie chart with data in it instead of a managed bean with login infos. Maybe the problem is with the data, but I don't know how the data is passed from a taskflow to a WebCenter project or even if it is possible. But, I know that the pie chart should be.

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