raise exception if the method is used to overwrite the existing seed
raise exception if the method is used to overwrite the existing seed

cryptapus/electrum-myr,romanz/electrum,vialectrum/vialectrum,cryptapus/electrum-uno,molecular/electrum,pooler/electrum-ltc,vertcoin/electrum-vtc,dabura667/electrum,pooler/electrum-ltc,digitalbitbox/electrum,protonn/Electrum-Cash,lbryio/lbryum,asfin/electrum,FairCoinTeam/electrum-fair,vialectrum/vialectrum,vertcoin/electrum-vtc,aasiutin/electrum,kyuupichan/electrum,dashpay/electrum-dash,procrasti/electrum,cryptapus/electrum,FairCoinTeam/electrum-fair,spesmilo/electrum,argentumproject/electrum-arg,molecular/electrum,vertcoin/electrum-vtc,wakiyamap/electrum-mona,pknight007/electrum-vtc,aasiutin/electrum,spesmilo/electrum,asfin/electrum,fireduck64/electrum,romanz/electrum,procrasti/electrum,argentumproject/electrum-arg,lbryio/lbryum,digitalbitbox/electrum,wakiyamap/electrum-mona,fujicoin/electrum-fjc,pknight007/electrum-vtc,molecular/electrum,fireduck64/electrum,protonn/Electrum-Cash,cryptapus/electrum-myr,dabura667/electrum,argentumproject/electrum-arg,molecular/electrum,argentumproject/electrum-arg,neocogent/electrum,spesmilo/electrum,dashpay/electrum-dash,cryptapus/electrum-uno,fireduck64/electrum,dabura667/electrum,romanz/electrum,cryptapus/electrum,cryptapus/electrum-myr,vialectrum/vialectrum,FairCoinTeam/electrum-fair,wakiyamap/electrum-mona,fyookball/electrum,cryptapus/electrum,wakiyamap/electrum-mona,aasiutin/electrum,neocogent/electrum,imrehg/electrum,neocogent/electrum,imrehg/electrum,protonn/Electrum-Cash,fireduck64/electrum,protonn/Electrum-Cash,pooler/electrum-ltc,digitalbitbox/electrum,cryptapus/electrum-uno,vertcoin/electrum-vtc,pooler/electrum-ltc,kyuupichan/electrum,asfin/electrum,dabura667/electrum,pknight007/electrum-vtc,procrasti/electrum,imrehg/electrum,cryptapus/electrum-uno,procrasti/electrum,FairCoinTeam/electrum-fair,fujicoin/electrum-fjc,fyookball/electrum,fujicoin/electrum-fjc,cryptapus/electrum-myr,pknight007/electrum-vtc,digitalbitbox/electrum,kyuupichan/electrum,dashpay/electrum-dash,dashpay/electrum-dash,imrehg/electrum,aasiutin/electrum,fyookball/electrum,spesmilo/electrum