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Remove gas from your attack function, and change the fallback() payable to receive() payable. The contract will work without any errors. Although you have some bugs in your contract. You mentioned in …

You can do that in remix too. …

I have tried your code and figured out how the inputs should be provided. You just need to send a variable array of arrays containing exactly 4 elements. For example, [[1,2,3,4],[5,6,7,8],[9,10,11,12] …

You are missing a closing parenthesis. Just add one at the end and your code will be good to go. Edit: Please confirm if this is your final code // SPDX-License-Identifier: MIT pragma solidity ^0.8.0 …

I don't think you can use "view" in the abstract contract you have defined at the top. The template you are using is for the interfaces. Interfaces provide overriding with "view" funcitonality, but no …

The problem is that you are trying to deploy the contract with the 100 wei amount. The 1_Storage.sol contract doesn't have a payable constructor, so it doesn't need any amount of ETH as input. Just se …

Getting returned data from a function that potentially changes the state of the blockchain is impossible. This is one of the limitations of Solidity. That's why the function is returning the full bloc …

You can see the error right there. insufficient allowance. As you can see, you are using transferFrom() function in the depositTokens() function. For using transferFrom, you need to first approve the …

That's not how a contract works. You are using payable keyword in the function. That means it is expecting an ETH value. You cannot use .transfer() method and try to send the ETH to the contract. The …

I don't think this can be a standard, since it disrupts the core feature of blockchain, ie, the removal of a central authority. If you give that right to anyone other than the token owner, it will be …

There are multiple errors in your code. Apparently, you have not declared variables and mappings (that's why the undeclared variable error). Create a mapping of allowed if you want to use it. mapping( …

You are missing a parenthesis or round bracket in your code. policyHolder.notify("Payout triggered! You will receive: " + uint256(payoutAmount)); Although, this code has multiple errors, not declarin …

You need to copy the contract's code, paste it on remix, and create and instance of the contract on the same address as it is already deployed to (Also the same chain). …

I tested your contract and it seems fine. But I still encountered the error you mentioned. The issue with my deployment was that I forgot to update the token address in the PurchaseTicket contract. IE …