Error in FundMe project

[laith1992]

 function fund() public  {
        require(msg.value.getConversionRate() >= MINIMUM_USD, "You need to spend more ETH!");
        // require(PriceConverter.getConversionRate(msg.value) >= MINIMUM_USD, "You need to spend more ETH!");
        addressToAmountFunded[msg.sender] += msg.value;
        funders.push(msg.sender);
    }

I have this error:

TypeError: "msg.value" and "callvalue()" can only be used in payable public functions. Make the function "payable" or use an internal function to avoid this error.

can anyone help me ?

[khal45]

You need to add payable keyword to the function to make the function payable. As the error suggests, only payable functions can use msg.value

 function fund() public payable // add the payable keyword here