Transaction reverting when it hits Require statement in payable function

Question

So briefly, when the user clicks a submit button from UI, it needs to pass a fixed price _price to pay() function (there are options to choose a fixed price on UI ex: 0.01, 0.02, 0.03). In the function, it checks if the msg.value is equal to the amount passed from the UI. Then the sender sends that price to the contract address and it adds up to the total contract balance. When I debug it with remix, it gives an error message when it hits require(_price == msg.value)

transact to Test.pay errored: VM error: revert. revert The transaction has been reverted to the initial state. Note: The constructor should be payable if you send value. Debug the transaction to get more information.

contract Test {

    function Test() {
        owner = msg.sender;
    }

    function pay(uint _price) payable returns (bool) {
        //...

        require(_price == msg.value); // Check ether sent is matching with the price
        address(this).transfer(msg.value); // Send price to the contract address
        balanceOfContract[address(this)] += msg.value; // Store price to current contract balance

        LogDeposit(msg.sender, msg.value);

        return true;
    }
}

I increased the gas limit just in case, but still giving me the error. Help is appreciated!

Answer 1

Summarizing the findings in the comment thread:

The issue was that the _price passed in to the pay function was being specified in ether rather than in wei. msg.value is always in wei, so the require was failing.