function addAddressToPrivateWhiteList(address _addr, uint256 _amount)
        public onlyOwner
    {
        
        require(block.timestamp < TIMESTAMP_OF_20181002000001);
        
        
        
        require(!hasRole(_addr, ROLE_PRIVATESALEWHITELIST));

        addRole(_addr, ROLE_PRIVATESALEWHITELIST);
        approve(_addr, _amount);
        
        privateSaleAgentsIndex[_addr] = privateSaleAgents.length;
        privateSaleAgents.push(_addr);
    }