The error message indicates that authorization with the Picasa Picture Service failed due to security settings in the user's Google Account.
Starting mid 2015 Google enforced using OAuth login for 3rd party applications like iSale. Currently iSale does not yet support this kind of authorization. However, you can re-enable the old login method by following these steps:
1. Open the Google account settings in a browser and log into your account: https://myaccount.google.com/ (make sure it is the account you plan to use with iSale)
2. Select "Sign-in & security"
3. Scroll down to "Connected apps & sites"
4. Change the setting "Allow less secure apps" to "ON"
Go back to iSale's Pictures preferences and log into your Picasa Web Albums Account.
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