Deploy address error Remix Solidity contract flashloan

Question

I'm learning Solidity. Trying to implement this contract: Flashloaner.sol

pragma solidity =0.6.6;

import './UniswapV2Library.sol';
import './interfaces/IUniswapV2Router02.sol';
import './interfaces/IUniswapV2Pair.sol';
import './interfaces/IERC20.sol';
//import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.5.1/contracts/math/SafeMath.sol";


contract FlashLoaner {
  IUniswapV2Router02 immutable sushiRouter;
  address immutable factory;
  uint constant deadline = 10 days;

  constructor(address _factory, address _uniRouter, address _sushiRouter) public {
    factory = _factory;  
    sushiRouter = IUniswapV2Router02(_sushiRouter);
  }

  function uniswapV2Call(address _sender, uint _amount0, uint _amount1, bytes calldata _data) external {
      address[] memory path = new address[](2);
      uint amountToken = _amount0 == 0 ? _amount1 : _amount0;
      
      address token0 = IUniswapV2Pair(msg.sender).token0();
      address token1 = IUniswapV2Pair(msg.sender).token1();

      require(msg.sender == UniswapV2Library.pairFor(factory, token0, token1), "Unauthorized"); 
      require(_amount0 == 0 || _amount1 == 0);

      path[0] = _amount0 == 0 ? token1 : token0;
      path[1] = _amount0 == 0 ? token0 : token1;

      IERC20 token = IERC20(_amount0 == 0 ? token1 : token0);
      
      token.approve(address(sushiRouter), amountToken);

      // no need for require() check, if amount required is not sent sushiRouter will revert
      uint amountRequired = UniswapV2Library.getAmountsIn(factory, amountToken, path)[0];
      uint amountReceived = sushiRouter.swapExactTokensForTokens(amountToken, amountRequired, path, msg.sender, deadline)[1];

      // YEAHH PROFIT
      token.transfer(_sender, amountReceived - amountRequired);
    
  }
}

In Remix where I have installed the folders and files from this project. After compiling the contract I have Remix set on: Injected Web3 with my MetaMask connected. The error on trying to deploy is:

creation of FlashLoaner errored: Error encoding arguments: Error: invalid address (argument="address", value="", code=INVALID_ARGUMENT, version=address/5.1.0) (argument=null, value="", code=INVALID_ARGUMENT, version=abi/5.1.2)

Do I need to hardcode the 'address' elements someplace?

Further, on compiling there are warnings about this code from the contract:

constructor(address _factory, address _uniRouter, address _sushiRouter) public {
    factory = _factory;  
    sushiRouter = IUniswapV2Router02(_sushiRouter);

The warning is:

flash-loans/contracts/FlashLoaner.sol:15:33: Warning: Unused function parameter. Remove or comment out the variable name to silence this warning. constructor(address _factory, address _uniRouter, address _sushiRouter) public { ^----------------^

There's something fundamental I am missing in trying to deploy this contract. Any pointers much appreciated!

Answer 1

So - I saw that there's too much going on here and set up everything locally using Go-ethereum.

Using Truffle.

Answer 2

What addresses do you use for _FACTORY and _SUSHIROUTER ?

Is it the Uniswap Factory address and the SUshiswap router address for arbitrage?