I tried modify the castVote function to allow voters to change their vote on a particular proposal.I also tried to figure out a new way to track which addresses have already voted on which proposal. But i keep running this this error : TypeError: Struct containing a (nested) mapping cannot be constructed. --> src/Voting.sol:19:47: | 19 | Proposal memory newProposalInstance = Proposal({ | ^ (Relevant source part starts here and spans across multiple lines).

I tried modify the castVote function to allow voters to change their vote on a particular proposal.I also tried to figure out a new way to track which addresses have already voted on which proposal. But i keep running this this error :

TypeError: Struct containing a (nested) mapping cannot be constructed.
  --> src/Voting.sol:19:47:
   |
19 |         Proposal memory newProposalInstance = Proposal({
   |                                               ^ (Relevant source part starts here and spans across multiple lines).

// SPDX-License-Identifier: MIT pragma solidity ^0.8.20;

contract Voting { struct Proposal { address target; bytes data; uint yesCount; uint noCount; mapping(address => bool) hasVoted; // Keep track of whether an address has voted }

Proposal[] public proposals;

function newProposal(address _target, bytes calldata _data) external {
    Proposal memory newProposalInstance = Proposal({
        target: _target,
        data: _data,
        yesCount: 0,
        noCount: 0
    });

    proposals.push(newProposalInstance);
}

function castVote(uint proposalId, bool supportsProposal) external {
    require(proposalId < proposals.length, "Invalid proposalId");

    Proposal storage proposal = proposals[proposalId];

    // Check if the voter has already voted
    require(!proposal.hasVoted[msg.sender], "Address has already voted");

    // If the voter previously voted yes, decrement yesCount; if voted no, decrement noCount
    if (proposal.hasVoted[msg.sender]) {
        if (proposal.hasVoted[msg.sender] == true) {
            proposal.yesCount--;
        } else {
            proposal.noCount--;
        }
    }

    // Update the vote and mark the voter as having voted
    if (supportsProposal) {
        proposal.yesCount++;
    } else {
        proposal.noCount++;
    }
    proposal.hasVoted[msg.sender] = supportsProposal;
}

}

Please help, i can solve the above error.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract Voting {
    struct Proposal {
        address target;
        bytes data;
        uint yesCount;
        uint noCount;
        mapping(address => bool) hasVoted; // Keep track of whether an address has voted
    }

    Proposal[] public proposals;

    function newProposal(address _target, bytes calldata _data) external {
        Proposal memory newProposalInstance = Proposal({
            target: _target,
            data: _data,
            yesCount: 0,
            noCount: 0
        });

        proposals.push(newProposalInstance);
    }

    function castVote(uint proposalId, bool supportsProposal) external {
        require(proposalId < proposals.length, "Invalid proposalId");

        Proposal storage proposal = proposals[proposalId];

        // Check if the voter has already voted
        require(!proposal.hasVoted[msg.sender], "Address has already voted");

        // If the voter previously voted yes, decrement yesCount; if voted no, decrement noCount
        if (proposal.hasVoted[msg.sender]) {
            if (proposal.hasVoted[msg.sender] == true) {
                proposal.yesCount--;
            } else {
                proposal.noCount--;
            }
        }

        // Update the vote and mark the voter as having voted
        if (supportsProposal) {
            proposal.yesCount++;
        } else {
            proposal.noCount++;
        }
        proposal.hasVoted[msg.sender] = supportsProposal;
    }
}

Please help figure out how to solve the error shared above.