我在相关节点上运行了zookeeper守护程序，正在尝试启动kafka代理，但出现以下错误：

FATAL [Kafka Server 13], Fatal error during KafkaServer startup. Prepare to shutdown (kafka.server.KafkaServer)
java.lang.NumberFormatException: For input string: "2181""
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:492)
    at java.lang.Integer.parseInt(Integer.java:527)
    at org.apache.zookeeper.client.ConnectStringParser.<init>(ConnectStringParser.java:72)
    at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:443)
    at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:380)
    at org.I0Itec.zkclient.ZkConnection.connect(ZkConnection.java:64)
    at org.I0Itec.zkclient.ZkClient.connect(ZkClient.java:876)
    at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:98)
    at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:84)
    at kafka.server.KafkaServer.initZk(KafkaServer.scala:157)
    at kafka.server.KafkaServer.startup(KafkaServer.scala:82)
    at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:29)
    at kafka.Kafka$.main(Kafka.scala:46)
    at kafka.Kafka.main(Kafka.scala)

我的服务器.properties

broker.id=13
port=9092
host.name=node013
num.network.threads=3
num.io.threads=8
zookeeper.connect="node014:2181,node135:2181,node136:2181"
zookeeper.connection.timeout.ms=6000

和zookeeper.properties

dataDir=/tmp/zookeeper
clientPort=2181
maxClientCnxns=0

我已经试过了，但是没有弄清楚为什么错误日志在端口属性中显示了额外的。知道是什么导致了这个问题吗？