Fail to run report made with report builder

Hi,

I am completely new to Report Builder. I created and deployed a report model and opened the Report Builder, and created a very simple report by dragging a table into the report. When running the report i get this error:

Keyword not supported: 'provider'.
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Cannot create a connection to data source 'dataSource1'.
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An error has occurred during report processing.
The data source name that I used in the report model was not called dataSource1.

Approximately the same error is displayed if I deploy (save) the report to the report server:

An error has occurred during report processing.
Cannot create a connection to data source 'dataSource1'.
Keyword not supported: 'provider'.
The report server itself seems to work fine, because I can deploy reports that are created the old way (ie from within BI Development Studio)

I am using the September CTP.

BR
KaDid you create model using Model Designer?