General Thread for practicing question formatting

[prachi078]

    function fund() public {
       

        require(msg.value.getConversionRate() >= minimumUsd, "Didn't send enough"); 
        funders.push(msg.sender);
        addressToAmountFunded[msg.sender] = msg.value;//msg.sender is the address of whoever calls the fun function
    }

on this function, i'm running into an 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 someone tell me what's going on?

[alfaqi]

Add payable to function, like this

function fund() public payable{