You can try to add xpromo.g5e.com in the list of unrestricted websites.
You can follow the instruction below:
- Go to System Preferences.
- Select Parental Controls.
- Sign in the username and password.
- Click on "Website Restrictions".
- Select "Allow access to only these websites".
- Add xpromo.g5e.com to the list.
- Press "OK" and start the game once again.