SOLIDITY REMIX 编译器，在部署我的合约后收到此错误（无效的 BigNumber 字符串）

Question

I'm working on my Udemy course project.. the problem with this course is that been used old version solidity 0.4.17.. I'm trying to update this project to a current version... after updating the code and tried to compile on Remix compiler... it compiles with no any errors or warnings on the specific lines, but when I try to deploy a contract on remix:

it shows:

creation of Campaign errored: Error encoding arguments: Error: invalid BigNumber string (argument="value", value="", code=INVALID_ARGUMENT, version=bignumber/5.1.1)

so I don't really understand what is the problem here?

this is my solidity contract code:

// SPDX-License-Identifier: GPL-3.0

pragma solidity >0.4.17 <0.8.0;

contract CampaignFactory {

address[] public deployedCampaigns;

function createCampaign(uint minimum) public {
    address newCampaign = address ( new Campaign(minimum, msg.sender));
    deployedCampaigns.push(newCampaign);
}

function getDeployedCampaigns() public view returns (address[] memory) {
    return deployedCampaigns;
}

}

contract Campaign {

struct Request {
    string description;
    uint value;
    address recipient;
    bool complete;
    uint approvalCount;
    mapping(address => bool) approvals;
}

Request[] public requests;
address public manager;

uint public minimumContribution;

mapping(address => bool) public approvers;

uint public approversCount;

modifier restricted() {
    require(msg.sender == manager);
    _;
}

constructor(uint minimum, address creator){
    
    manager = creator;
    minimumContribution = minimum;
}

function contribute() public payable {
    require(msg.value > minimumContribution);
    
    approvers[msg.sender] = true;
    approversCount++;
}

uint numRequest;


function creatRequest(string memory description, uint value, address recipient) public restricted {
            
    Request storage newRequest = requests[numRequest++];
       newRequest.description = description;
       newRequest.value = value;
       newRequest.recipient = recipient;
       newRequest.complete = false;
       newRequest.approvalCount = 0;
    
}

function approveRequest(uint index) public {
    Request storage request = requests[index];
    require(approvers[msg.sender]);
    require(!request.approvals[msg.sender]);
    
    request.approvals[msg.sender] = true;
    request.approvalCount++;
}


function finalizeRequest(uint index) public restricted {
    Request storage request = requests[index];
    
    require(request.approvalCount > (approversCount / 2));
    require(!request.complete);
    
    payable(request.recipient).transfer(request.value);
    request.complete = true;
}

}

thank you in advance for taking your time to look at this problem...

EDIT:

Ok I manager to pass this error, but now when I try to create my request I get an error:

[vm] from: 0x5B3...eddC4to: Campaign.creatRequest(string,uint256,address) 0x7b9...b6AcEvalue: 0 weidata: 0x83e...00000logs: 0hash: 0x8d9...a5ccb transact to Campaign.creatRequest errored: VM error: invalid opcode. invalid opcode The execution might have thrown. Debug the transaction to get more information.

so the steps I do:

1. set my minimum contribution to "0" and add a creator address "0x0ABC"

2. I contribute 1 Ether with same address "0x0ABC"

3. and I pick a random different address from the remix copy and paste into my "createRequest" I add string "string" amount "uint" address "0x0CCC"

and when I click createRequest I get this error I stated above;

Answer 1

Solidity currently (v0.8) doesn't allow writing a "struct containing a mapping" into a storage array . But you can write it into a mapping .

mapping (uint => Request) public requests;  // changed to mapping

instead of

Request[] public requests;  // original code

You'll lose the ability to retrieve the array length. But you're already keeping it in the numRequest variable, so it's all good.