title: getting error while using livybatch operator in Airflow , DAG getting crashed
body: <p>Can someone help me on this while using livybatchoperator in Airflow , below is my code  ...
  apart from that what's other way to run spark job in airflow except spark operator, spark is installed on different machine in my case.</p>
  <p>I'm getting this error : <code>Getting Error in Airflow UI - &quot;No module named 'airflow_livy'&quot;</code> .</p>
  <pre><code>```    
      from datetime import datetime, timedelta
      from airflow_livy.batch import LivyBatchOperator
      from airflow.contrib.operators.spark_submit_operator import SparkSubmitOperator
      from airflow.models import DAG
      
      default_args = {
          'owner': 'airflow',
          'start-date': datetime(2020, 8, 4),
          'retires': 0,
          'catchup': False,
          'retry-delay': timedelta(minutes=5),
      }
      
      
      
      
      dag_config: DAG = DAG(
          'Airflow7', description='Hello world example', schedule_interval='0 12 * * *',
          start_date=datetime(2020, 8, 4), catchup=False)
      
      
      
      
      livy_Operator_SubmitTask = LivyBatchOperator(
          task_id='spark-submit_job_livy',
          class_name='Class name ',
          file='File path of my jar',
          arguments=['Test'],
          verify_in='spark',
          dag=dag_config
      )
      
      
      
      livy_Operator_SubmitTask```
  </code></pre>