title: Airflow 2.0 - Could not automatically determine credentials (GOOGLE_APPLICATION_CREDENTIALS)
body: <p>I have the following code from the example-dags at "<a href="https://github.com/apache/airflow/tree/master/airflow/providers/google/cloud/example_dags" rel="nofollow noreferrer">https://github.com/apache/airflow/tree/master/airflow/providers/google/cloud/example_dags</a>":</p>
  
  <pre><code>import os
  from airflow import models
  from airflow.providers.google.cloud.operators.bigquery import (
      BigQueryCreateEmptyDatasetOperator, BigQueryDeleteDatasetOperator,
  )
  from airflow.utils.dates import days_ago
  
  PROJECT_ID = os.environ.get("GCP_PROJECT_ID", "project_id")
  DATASET_NAME = os.environ.get("GCP_BIGQUERY_DATASET_NAME", "dataset_id")
  
  default_args = {"start_date": days_ago(1)}
  
  with models.DAG( "test_dag" , default_args=default_args , schedule_interval=None , tags=["testing"] ) as dag:
  
  create_dataset = BigQueryCreateEmptyDatasetOperator(
          task_id="create_dataset", dataset_id=DATASET_NAME
      )
  
      delete_dataset = BigQueryDeleteDatasetOperator(
          task_id="delete_dataset", dataset_id=DATASET_NAME, delete_contents=True
      )
  
      create_dataset &gt;&gt; delete_dataset
  </code></pre>
  
  <p>I just want to debug my Airflow connection with Google Cloud, creating a dataset and then removing it. I am currently getting this error:</p>
  
  <pre><code>Traceback (most recent call last): 
  File "/home/airflow/.local/lib/python3.6/site-packages/google/cloud/_helpers.py", line 186, in _determine_default_project _, project = google.auth.default()
  File "/home/airflow/.local/lib/python3.6/site-packages/google/auth/_default.py", line 321, in default raise exceptions.DefaultCredentialsError(_HELP_MESSAGE) google.auth.exceptions.DefaultCredentialsError: Could not automatically determine credentials. Please set GOOGLE_APPLICATION_CREDENTIALS or explicitly create credentials and re-run the application. For more information, please see https://cloud.google.com/docs/authentication/getting-started
  </code></pre>
  
  <p>After getting this message, I tried to set an environment variable with an assigned path and to add it explicit in the code. None of this options worked. The problem is that any path seem to be unreachable <strong>"google.auth.exceptions.DefaultCredentialsError: File was not found"</strong></p>