Hello,
1. Is this error on a new site or on an existing site?
2. Are you using the CoinPayments adapter?
If you are using the CoinPayments adapter, please see here for a complete troubleshooter: https://www.dashed-slug.net/howto-debug-an-incoming-deposit-coinpayments-adapter/ You will likely have to contact your hosting provider about incoming IPNs.
If you are using a full node wallet, see here: https://www.dashed-slug.net/howto-debug-an-incoming-deposit-full-node-wallet/
Let me know if the above didn’t help.
with regards