Error in the tutorial "Create workflow (3), Build a task workflow"?

There’s an error as I ran the task “Calculate Statistics” in the tutorial Create workflow (3), Build a task workflow.

Detail of the error:

It’s strange, because the connection VORA_CATLOG_CONN_DEFAULT is already used successfully in another task (“Create workflow (part 2), Aggregate data with flowgraph).

Did I do anything wrong?