While registering at CGPeers:

Case 1: You may get Error: 0xE4000006 error. If that is the case, try changing your email address (try a different Gmail id).

Case 2: You may get Error: 0xE400000A. In this case you need to change your IP. If you are using dynamic IP, switch OFF / switch ON your modem/router and then try again. If you are using a static IP, try registering from your mobile phone.