Here are some troubleshooting steps that might help:

1. Please make sure your internet connection is stable.
2. Please make sure you have not restricted in-app purchases on your device.
3. Try changing the internet connection or the payment method on your device.
4. Try restarting your device and relaunching the game

If you still have problems making purchases after trying these steps, please contact us with a screenshot of the message you received when you were making a purchase.