我在 Mosquitto 上看到了这个错误，有人能告诉我如何解决这个问题吗？
? mosquitto -v
1483089866: mosquitto version 1.4.9 (build date 08/06/2016 11:59:29.51) starting
1483089866: Using default config.
1483089866: Opening ipv6 listen socket on port 1883.
1483089866: Error: Only one usage of each socket address (protocol/network address/port) is normally permitted.
mqtt ×1