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how i can solve the following nifi error

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how i can solve the following nifi error

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ERROR [Timer-Driven Process Thread-4] o.a.nifi.remote.StandardRemoteGroupPort RemoteGroupPort[name=agent,targets=http://172.21.35.90:9990/nifi] failed to communicate with http://172.21.35.90:9990/nifi because the remote instance indicates that the port is not in a valid state