This error occurs when your store login information does not match your authentication username/password. Follow the steps below to update your password so that both passwords match:

1. Login to the Aptana online store.
2. Click your Account History link.
3. Click the link to your license.
4. Update your license password so that it matches your store account.
5. Click the Update License Information button to save your changes.
6. In Aptana Studio Pro, update your authentication password to to match your updated store account password.