Could not construct applicationdefaultcredentials

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The error “could not construct applicationdefaultcredentials” occurs when attempting to authenticate with Google Cloud Platform using Application Default Credentials (ADC), but the credentials cannot be created or found.

Application Default Credentials provide a convenient way to authenticate your application without specifying the credentials directly. It uses a hierarchy of possible sources, including environment variables, user credentials, and service account credentials, to determine the credentials to use.

Here are some common causes and solutions for this error:

  1. No default credentials configured: Make sure you have the necessary environment variables set or the ADC default credentials file available. The most common environment variable is GOOGLE_APPLICATION_CREDENTIALS, which should point to a JSON file containing the service account key.
  2. Missing or incorrect environment variable: Double-check the environment variable value to ensure it is correct and points to the correct file path.
  3. Permissions issue: Ensure that the configured service account has the necessary permissions to access the Google Cloud resources you are using. This can be done via the Google Cloud Console or through the IAM & admin APIs.
  4. Invalid or expired credentials: Verify that the provided credentials are still valid and have not expired. You may need to regenerate or re-download the credentials.

Example usage of ADC in Python: 

import os
from google.oauth2 import service_account
from google.cloud import storage

# Set the path to the JSON credentials file
os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = "/path/to/credentials.json"

# Use ADC to authenticate the client
storage_client = storage.Client()

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