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Dataflow Real-Time node status is Unknown

We have built a Dataflow using Twitter Dataset but when running the data flow we are getting an error :

Cannot execute the data flow run, because there are currently no functional data flow nodes in the cluster for the
RealTime
service. Ensure that there is at least one data flow node in the cluster with status 'Normal' via the
Data Flow Services landing page

When checking in Data Flow Services landing page, we see the node is having a status of UNKNOWN instead of NORMAL.

The dropdown for the execute link is not showing up and clicking on the execute link shows error.
The stack trace (Real-Time_NodeError - Copy.txt) is attached.

When checking in Decision Data Store, we see the same node showing status as Normal, with stop/repair options too.(Screenshots attached).

Could anyone please let us know how to resolve this ?