The error you mentioned indicates that the DNS name coinpayments.net was not resolved by your server, possibly due to bad internet connectivity. I assume that the error should have resolved by now. If not, it would indicate misconfiguration of your DNS system, and this should be addressed by your server host.
I have moved your post to a new thread. In the future could you please open a new thread whenever you experience a new issue? The thread you posted on was opened for something completely different.