Adding Web Screen to web flow launches error

Adding Web Screen to web flow launches error

  
Greetings.

I'm doing the Developer Course 1 and when I get to topic 6.2 - Rich Ajax Interfaces, while trying to add a new screen to hold an Info Balloon (16.2) I always get an error trying to add a new Web Screen to my web flow, whether I drag it from the tools tree on the left or right clicking  the Main Flow on the right and choosing Add Web Screen.

I'm using Service Studio 5.1.0.10.





Please advise.
Thanks.
Do you have a WebBlock named Header or Footer in more than one WebFlow?  If that is the case that problem has been fixed in Service Studio 5.1.0.13

Best Regards,
Gustavo Guerra
Indeed I had a WebBlock named Header or Footer in more than one WebFlow.

Thank you Gustavo.