The Invalid Flow error is issued in the following situations:

Edit the eSpace properties and uncheck the Use Cookies eSpace property.

Edit your flow and connect this element to one of the existing elements, otherwise that element will not be executed.

Edit your flow and add the necessary number of outgoing connectors to this element.

Clicking the symbol will take you directly to the parent flow and highlights the particular element.

See Also

eSpace Properties | About Error Messages