Dear all,

I am upgrading DBR version from 9.1 LTS to 15.4 LTS in Azure Databricks. for that I have created a new cluster with 15.4 DBR attached init script for installing application dependencies. Cluster has started successfully but it takes 30 min. So, when I run my application I am getting below error. what is the reason of issue and how to resolve that?                                                                                                                                                                      Py4JJavaError: An error occurred while calling z:org.apache.spark.api.python.PythonRDD.runJob.
: org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 0.0 failed 4 times, most recent failure: Lost task 0.3 in stage 0.0 (TID 3) (10.141.5.11 executor 5): org.apache.spark.api.python.PythonException: Traceback (most recent call last):
File "/databricks/spark/python/pyspark/serializers.py", line 192, in _read_with_length
return self.loads(obj)
^^^^^^^^^^^^^^^
File "/databricks/spark/python/pyspark/serializers.py", line 572, in loads
return cloudpickle.loads(obj, encoding=encoding)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'dbruntime'