Troubleshoot authentication and authorization issues

This page describes some common issues that you might encounter involving authentication and authorization.

`This app isn't verified`

If the OAuth consent screen displays the warning "This app isn't verified," your app is requesting scopes that provide access to sensitive user data. If your application uses sensitive scopes, your app must go through the verification process to remove that warning and other limitations. During the development phase, you can continue past this warning by selecting Advanced > Go to {Project Name} (unsafe).

`File not found error for credentials.json`

When running the code sample, you might receive a "file not found" or "no such file" error message regarding credentials.json.

This error occurs when you have not authorized the desktop application credentials. To learn how to create credentials for a desktop application, go to Create credentials.

After you create the credentials, make sure the downloaded JSON file is saved as credentials.json. Then move the file to your working directory.

`Token has been expired or revoked`

When running the code sample, you might receive a "Token has been expired" or "Token has been revoked" error message.

This error occurs when an access token from the Google Authorization Server has either expired or has been revoked. For information about potential causes and fixes, see Refresh token expiration.

Python errors

The following are some common Python errors.

`AttributeError: 'Module_six_moves_urllib_parse' object has no attribute 'urlparse'`

This error can occur in Mac OSX where the default installation of the six module (a dependency of the Python library) is loaded before the one that pip installed. To fix the issue, add pip's install location to the PYTHONPATH system environment variable:

Determine pip's install location:
```
pip show six | grep "Location:" | cut -d " " -f2
```
Make a note of this location because it's needed for the next step.
Add the following line to your ~/.bashrc file, replacing INSTALL_PATH with the location determined from the previous step:
```
export PYTHONPATH=$PYTHONPATH:INSTALL_PATH
```
Reload your ~/.bashrc file:
```
source ~/.bashrc
```

`TypeError: sequence item 0: expected str instance, bytes found`

This error is due to a bug in httplib2. To resolve this problem, upgrade to the latest version of httplib2:

pip install --upgrade httplib2

`Cannot uninstall 'six'`

When running the pip install command, you might receive the following error:

Cannot uninstall 'six'. It is a distutils installed project and thus we
cannot accurately determine which files belong to it which would lead to
only a partial uninstall.

This error occurs on Mac OSX when pip attempts to upgrade the pre-installed six package. To work around this issue, add the flag --ignore-installed six to the pip install command.