java.lang.Exception: Specified output attribute key is not available.

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java.lang.Exception: Specified output attribute key is not available.
at com.ibm.streamsx.messaging.kafka.SimpleConsumerClient.initialize(SimpleConsumerClient.java:296)
at com.ibm.streamsx.messaging.kafka.KafkaSource.allPortsReady(KafkaSource.java:132)
at com.ibm.streams.operator.internal.runtime.api.OperatorAdapter.allPortsReady(OperatorAdapter.java:789)
at com.ibm.streams.operator.internal.jni.JNIBridge.allPortsReady(JNIBridge.java:626)

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