Error Running Sample Notebook - Azure Machine Learning Pipeline with NotebookRunnerStep

Currently Trying to execute this [Sample Notebook](https://github.com/Azure/MachineLearningNotebooks/blob/master/how-to-use-azureml/machine-learning-pipelines/intro-to-pipelines/aml-pipelines-with-notebook-runner-step.ipynb).

I get the following error when Creating Notebook run configuration and setting parameter values as shown below

`handler = AzureMLNotebookHandler(timeout=600, progress_bar=False, log_output=True)

cfg = NotebookRunConfig(source_directory=source_directory, notebook="training_notebook.ipynb",
handler = handler,
parameters={"arg1": "Machine Learning"},
run_config=conda_run_config)

print("Notebook Run Config is created.")`

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