is this a bug? ,i can not run show command

sqoop:000> show connector --all
Exception has occurred during processing command
Exception: com.sun.jersey.api.client.UniformInterfaceException Message: GET
http://localhost:12000/sqoop/v1/connector/all returned a response status of
404 Not Found
sqoop:000> set server --host localhost --port 8050 --webapp sqoop
Server is set successfully
sqoop:000> show connector --all
Exception has occurred during processing command
Exception: com.sun.jersey.api.client.ClientHandlerException Message:
java.net.ConnectException: Connection refused
sqoop:000> show server --all
Server host: localhost
Server port: 8050
Server webapp: sqoop
sqoop:000> show connector --all
Exception has occurred during processing command
Exception: com.sun.jersey.api.client.ClientHandlerException Message:
java.net.ConnectException: Connection refused

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