Error when calling the selfdistruct method in solidity

Question

I am quite new to solidity, and I have not managed to find a solution for this problem.

I am passing the function an address but it says the following: "Invalid type for argument in function call. Invalid implicit conversion from address to address payable request."

address admin;

function endSale() public {
 require(msg.sender == admin);
 selfdestruct(admin);
}

Answer 1

Elsewhere in the contract, find address admin; and declare it as address payable admin;.

Alternatively, selfdestruct(msg.sender); because require(msg.sender == admin); ensures they are the same and msg.sender should be payable.

Answer 2

As of Solidity 0.5.0, there are two different address types in solidity: address and address payable.

You can only transfer funds to an address payable.

Therefore, your problem will be fixed by making admin an address payable:

address payable admin;

Answer 3

You can cast to address payable with this code:

selfdestruct(address(uint160(admin)));

Solidity 0.6.x update:

selfdestruct(payable(admin));