ParserError: Expected primary expression. when using payable

Question

I have the following code:

    function payout() public payable {    
        uint ordersLength = orders.length;    
        uint totalRaised = 0;    
        for (uint i = 0; i < ordersLength; i++) {    
            totalRaised += orders[i].amount;    
            emit Amount(orders[i].amount);    
        }    
        for (uint i = 0; i < ordersLength; i++) {    
            payable(orders[i].investor).transfer(msg.value * orders[i].amount / totalRaised);        
            emit onPayout(orders[i].investor, creator, orders[i].investorId, creationId, creatorId, block.timestamp,        
                         msg.value * orders[i].amount / totalRaised);    
        }    
    }    

But upon compiling the contract, I'm getting this error:

project:/contracts/Creation.sol:59:13: ParserError: Expected primary expression.
            payable(orders[i].investor).transfer(msg.value * orders[i].amount / totalRaised);
            ^-----^

How to fix this?

Answer 1

The problem is because you are using a compiler version older than 0.6.

The solution is to use a compiler version more than or equals to 0.6 OR you can declare the investor field in your struct as address payable instead of address and you will not need to use the payable function because you will be able to transfer/send directly like this:

orders[i].investor.transfer(msg.value * orders[i].amount / totalRaised