oozie spark error

>>> Invoking Spark class now >>>

Traceback (most recent call last):
  File "/usr/hdp/current/spark-client/AnalyticsJar/wordcount.py", line 29, in <module>
    sc = SparkContext(conf=conf)
  File "/hadoop/yarn/local/filecache/662/spark-core_2.10-1.1.0.jar/pyspark/context.py", line 107, in __init__
  File "/hadoop/yarn/local/filecache/662/spark-core_2.10-1.1.0.jar/pyspark/context.py", line 155, in _do_init
  File "/hadoop/yarn/local/filecache/662/spark-core_2.10-1.1.0.jar/pyspark/context.py", line 201, in _initialize_context
  File "/hadoop/yarn/local/filecache/662/spark-core_2.10-1.1.0.jar/py4j/java_gateway.py", line 701, in __call__
  File "/hadoop/yarn/local/filecache/662/spark-core_2.10-1.1.0.jar/py4j/protocol.py", line 300, in get_return_value
py4j.protocol.Py4JJavaError: An error occurred while calling None.org.apache.spark.api.java.JavaSparkContext.
: org.apache.spark.SparkException: YARN mode not available ?
	at org.apache.spark.SparkContext$.org$apache$spark$SparkContext$$createTaskScheduler(SparkContext.scala:1586)
	at org.apache.spark.SparkContext.<init>(SparkContext.scala:310)
	at org.apache.spark.api.java.JavaSparkContext.<init>(JavaSparkContext.scala:53)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
	at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:234)
	at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:379)
	at py4j.Gateway.invoke(Gateway.java:214)
	at py4j.commands.ConstructorCommand.invokeConstructor(ConstructorCommand.java:79)
	at py4j.commands.ConstructorCommand.execute(ConstructorCommand.java:68)
	at py4j.GatewayConnection.run(GatewayConnection.java:207)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: org.apache.spark.scheduler.cluster.YarnClientClusterScheduler
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at org.apache.spark.SparkContext$.org$apache$spark$SparkContext$$createTaskScheduler(SparkContext.scala:1580)
	... 13 more

Intercepting System.exit(1)