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So, I have a flow that often hangs and doesn't "complete" even when the Reference tasks is done.  I see this error message come up in the logs:
```RuntimeError: cannot schedule new futures after shutdown```
Not sure what to do?  I don't want to manually have to set its state to "Success"

Screenshot 2021-03-31 184405.png

in the Schematic, they're shown as `mapped` but the mapped tasks are all Green.