function cancelUnregisteringServer(uint _serverIndex) public {
        Web3Server storage server = servers[_serverIndex];

        
        require(server.unregisterCaller!=address(0) &&  server.owner == msg.sender);

        
        
        if (server.unregisterCaller != server.owner) 
            server.owner.transfer( unregisterDeposit );

        server.unregisterCaller = address(0);
        server.unregisterTime = 0;
        
        emit LogServerUnregisterCanceled(server.url, server.owner);
    }