IB TWS "Order reject: unable to compute a monetary value for the underlying contract"

I am trying Interactive Brokers TWS. When I submit a BUY order for BNP (or any other SBF stock) I get an error message from TWS: "Order reject: we are unable to compute a monetary value for the underlying contract". Do you know why? Is it a limitation of the demo system? Will I be able to transmit orders on Euronext Paris once my IB account will be opened? Thank you for your hints...
 
Quote from ids:

Yes, it is a demo system limitation. SBF stocks are available.
Can you please give some quick answers on IB's sudden margin change on small cap as well?
 
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