Hum...
After the error, I clicked the 'Back' button twice and came back to 'Database Selection' page of the wizard. Clicked in 'Preview Database' button, and it populated the treview properly.
Then, I move forward again the wizard and the second time the 'Table Selection' page worked fine !
Can't reproduce it anymore! Don't know what happened. nothing was done with the database during this exercise.
Regards