I have an problem on my board that new members can not register because the error is " The email address is already in use by another member"

I used to use ipb 3.1.2 and on that version the error started to occur. So I thought to upgrading to ipb 3.1.4 would prevent that error but that was not the case. The error keeps there.

Please give me some advice to prevent this error.
WarezFreaks Reviewed by WarezFreaks on . Registration problem I have an problem on my board that new members can not register because the error is " The email address is already in use by another member" I used to use ipb 3.1.2 and on that version the error started to occur. So I thought to upgrading to ipb 3.1.4 would prevent that error but that was not the case. The error keeps there. Please give me some advice to prevent this error. Rating: 5