[ERROR] Error initializing SparkContext

[alstjs129]

Hi there.
i meet serious problem now

I installed with following commands:

helm repo add spark-operator https://kubeflow.github.io/spark-operator

helm repo update

helm install sparkoperator spark-operator/spark-operator --namespace spark-operator --create-namespace --set sparkJobNamespace=spark-operator

And I made my own docker image using the basic file that I have when I download Spark
with following command:

sudo ./bin/docker-image-tool.sh -r [dockerhubID] -t [tag] -p ./kubernetes/dockerfiles/spark/bindings/python/Dockerfile build
sudo ./bin/docker-image-tool.sh -r [dockerhubID] -t [tag] -p ./kubernetes/dockerfiles/spark/bindings/python/Dockerfile push

And apply the yaml file to the spark operator through the yaml file that provided kubeflow/examples/spark-py-pi.
Yaml only changed the docker image.

I used serviceaccount sparkoperator-spark that was created when the spark-operator was installed by helm.

my using yaml file

apiVersion: "sparkoperator.k8s.io/v1beta2"
kind: SparkApplication
metadata:
  name: pyspark-pi
spec:
  type: Python
  pythonVersion: "3"
  mode: cluster
  image: "[myOwnDockerimage]"
  imagePullPolicy: Always
  mainApplicationFile: local:///opt/spark/examples/src/main/python/pi.py
  sparkVersion: "3.5.1"
  restartPolicy:
    type: OnFailure
    onFailureRetries: 3
    onFailureRetryInterval: 10
    onSubmissionFailureRetries: 5
    onSubmissionFailureRetryInterval: 20
  driver:
    cores: 1
    coreLimit: "1200m"
    memory: "5120m"
    labels:
      version: 3.5.1
    serviceAccount: sparkoperator-spark
  executor:
    cores: 1
    instances: 1
    memory: "5120m"
    labels:
      version: 3.5.1

but error occured.
error log below

ERROR SparkContext: Error initializing SparkContext.
org.apache.spark.SparkException: External scheduler cannot be instantiated
	at org.apache.spark.SparkContext$.org$apache$spark$SparkContext$$createTaskScheduler(SparkContext.scala:3043)
	at org.apache.spark.SparkContext.<init>(SparkContext.scala:568)
	at org.apache.spark.api.java.JavaSparkContext.<init>(JavaSparkContext.scala:58)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Unknown Source)
	at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source)
	at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:247)
	at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:374)
	at py4j.Gateway.invoke(Gateway.java:238)
	at py4j.commands.ConstructorCommand.invokeConstructor(ConstructorCommand.java:80)
	at py4j.commands.ConstructorCommand.execute(ConstructorCommand.java:69)
	at py4j.ClientServerConnection.waitForCommands(ClientServerConnection.java:182)
	at py4j.ClientServerConnection.run(ClientServerConnection.java:106)
	at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Unknown Source)
	at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source)
	at org.apache.spark.scheduler.cluster.k8s.KubernetesClusterManager.makeExecutorPodsAllocator(KubernetesClusterManager.scala:185)
	at org.apache.spark.scheduler.cluster.k8s.KubernetesClusterManager.createSchedulerBackend(KubernetesClusterManager.scala:139)
	at org.apache.spark.SparkContext$.org$apache$spark$SparkContext$$createTaskScheduler(SparkContext.scala:3037)
	... 15 more

i think main problem is "ERROR SparkContext: Error initializing SparkContext." here

Has anyone solved it after experiencing a related error?

I don't know what I did wrong!!

ps.
I already changed serviceaccount to sparkoperator-spark-operator and my own serviceaccount.
i think it is not related to rbac problem.

I also already try change image to official spark image.

plz give me solution guys plz.