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java.lang.NullPointerException: 	at org.apache.kafka.common.config.AbstractConfig.(AbstractConfig.java:51)	at org.apache.kafka.common.config.AbstractConfig.(AbstractConfig.java:62)	at org.apache.kafka.connect.runtime.ConnectorConfig.(ConnectorConfig.java:79)	at org.apache.kafka.connect.runtime.SinkConnectorConfig.(SinkConnectorConfig.java:48)	at org.apache.kafka.connect.runtime.distributed.DistributedHerder.reconfigureConnector(DistributedHerder.java:842)	at org.apache.kafka.connect.runtime.distributed.DistributedHerder.reconfigureConnectorTasksWithRetry(DistributedHerder.java:799)	at org.apache.kafka.connect.runtime.distributed.DistributedHerder.access$800(DistributedHerder.java:92)	at org.apache.kafka.connect.runtime.distributed.DistributedHerder$11$1.call(DistributedHerder.java:812)	at org.apache.kafka.connect.runtime.distributed.DistributedHerder$11$1.call(DistributedHerder.java:809)	at org.apache.kafka.connect.runtime.distributed.DistributedHerder.tick(DistributedHerder.java:232)	at org.apache.kafka.connect.runtime.distributed.DistributedHerder.run(DistributedHerder.java:176)	at java.lang.Thread.run(Thread.java:745)