Exception in client-jaas.conf :org.apache.kafka.common.KafkaException: java.lang.SecurityException: java.io.IOException: Configuration Error: Line 3: expected [=], found [username]

[zealot-shin]

when I run with command in Read.md like this:
java -Djava.security.auth.login.config=./server-client-jaas.conf
-cp KafkaOffsetMonitor-assembly-0.4.6-SNAPSHOT.jar
com.quantifind.kafka.offsetapp.OffsetGetterWeb
--offsetStorage kafka
--kafkaBrokers xxxx:9092
--kafkaSecurityProtocol SASL_PLAINTEXT
--zk xxxx:2181
--port 8081
--refresh 10.seconds
--retain 2.days
--dbName offsetapp_kafka

and with my ./server-client-jaas.conf like this:
KafkaClient {
org.apache.kafka.common.security.plain.PlainLoginModule required
    username="qingteng"
    password="qeuo3GaZyXeUPy8X";
};

i got error like this:
ERROR OffsetGetter$:103 - Error creating ZkUtils. Will attempt to re-create in 30000 seconds
org.apache.kafka.common.KafkaException: java.lang.SecurityException: java.io.IOException: Configuration Error:
Line 3: expected [=], found [username]
at org.apache.kafka.common.security.JaasUtils.isZkSecurityEnabled(JaasUtils.java:102)
at com.quantifind.kafka.OffsetGetter$.createZkUtils(OffsetGetter.scala:246)
at com.quantifind.kafka.OffsetGetter$.getInstance(OffsetGetter.scala:273)
at com.quantifind.kafka.offsetapp.OffsetGetterWeb$.reportOffsets(OffsetGetterWeb.scala:74)
at com.quantifind.kafka.offsetapp.OffsetGetterWeb$$anonfun$schedule$1.apply$mcV$sp(OffsetGetterWeb.scala:99)
at com.quantifind.kafka.offsetapp.OffsetGetterWeb$$anon$2.run(OffsetGetterWeb.scala:48)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.SecurityException: java.io.IOException: Configuration Error:
Line 3: expected [=], found [username]
at sun.security.provider.ConfigFile$Spi.(ConfigFile.java:137)
at sun.security.provider.ConfigFile.(ConfigFile.java:102)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at java.lang.Class.newInstance(Class.java:442)
at javax.security.auth.login.Configuration$2.run(Configuration.java:255)
at javax.security.auth.login.Configuration$2.run(Configuration.java:247)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.Configuration.getConfiguration(Configuration.java:246)
at org.apache.kafka.common.security.JaasUtils.isZkSecurityEnabled(JaasUtils.java:99)
... 12 more
Caused by: java.io.IOException: Configuration Error:
Line 3: expected [=], found [username]
at sun.security.provider.ConfigFile$Spi.ioException(ConfigFile.java:666)
at sun.security.provider.ConfigFile$Spi.match(ConfigFile.java:532)
at sun.security.provider.ConfigFile$Spi.parseLoginEntry(ConfigFile.java:478)
at sun.security.provider.ConfigFile$Spi.readConfig(ConfigFile.java:427)
at sun.security.provider.ConfigFile$Spi.init(ConfigFile.java:329)
at sun.security.provider.ConfigFile$Spi.init(ConfigFile.java:271)
at sun.security.provider.ConfigFile$Spi.(ConfigFile.java:135)
... 23 more

it seems that client-jaas.conf's configuration is not right. But most says this is what it should be in this conf file.
So i'm wondering maybe it's my kafka version' problem.
My kafka server version is :
2.3.1