Kafka Connect Hdfs Sink Connector - Class io.confluent.connect.hdfs.string.StringFormat could not be found - apache-kafka

Question

Hi i am trying to move csv data from kafka to hdfs using hdfs sink connector and below are the properties i used
Connect.properties
name=hdfs-sink
connector.class=io.confluent.connect.hdfs.HdfsSinkConnector
format.class=io.confluent.connect.hdfs.string.StringFormat
tasks.max=1
topics=topic_name
hadoop.conf.dir=/etc/hadoop/conf
hdfs.url=hdfs://nameservice1/dir
flush.size=3
hdfs.authentication.kerberos=true
connect.hdfs.principal=principal
connect.hdfs.keytab=principal.keytab
hdfs.namenode.principal=principal
partitioner.class=io.confluent.connect.hdfs.partitioner.TimeBasedPartitioner
partition.duration.ms=300000
path.format=path.format='year'=YYYY/'month'=MM/'day'=dd
locale=en
timezone=EST
worker properties
bootstrap.servers=kafkaserver
plugin.path=/opt/confluent/share/java
key.converter=org.apache.kafka.connect.storage.StringConverter
value.converter=org.apache.kafka.connect.storage.StringConverter
internal.key.converter=org.apache.kafka.connect.json.JsonConverter
internal.value.converter=org.apache.kafka.connect.json.JsonConverter
offset.storage.file.filename=/tmp/connect.offsets
internal.key.converter.schemas.enable=false
internal.value.converter.schemas.enable=false
consumer.group.id=connect_group
consumer.auto.offset.reset=earliest
and i use confluent-5.0.1
but i get the below exception when i run kafka connect
java.util.concurrent.ExecutionException:
org.apache.kafka.connect.runtime.rest.errors.BadRequestException:
Connector configuration is invalid and contains the following 1
error(s): Invalid value io.confluent.connect.hdfs.string.StringFormat
for configuration format.class: Class
io.confluent.connect.hdfs.string.StringFormat could not be found.**
You can also find the above list of errors at the endpoint
/{connectorType}/config/validate at
org.apache.kafka.connect.util.ConvertingFutureCallback.result(ConvertingFutureCallback.java:79)
at
org.apache.kafka.connect.util.ConvertingFutureCallback.get(ConvertingFutureCallback.java:66)
at
org.apache.kafka.connect.cli.ConnectStandalone.main(ConnectStandalone.java:110)
Caused by:
org.apache.kafka.connect.runtime.rest.errors.BadRequestException:
Connector configuration is invalid and contains the following 1
error(s): Invalid value io.confluent.connect.hdfs.string.StringFormat
for configuration format.class: Class
io.confluent.connect.hdfs.string.StringFormat could not be found. You
can also find the above list of errors at the endpoint
/{connectorType}/config/validate at
org.apache.kafka.connect.runtime.AbstractHerder.maybeAddConfigErrors(AbstractHerder.java:423)
at
org.apache.kafka.connect.runtime.standalone.StandaloneHerder.putConnectorConfig(StandaloneHerder.java:189)
at
org.apache.kafka.connect.cli.ConnectStandalone.main(ConnectStandalone.java:107)