Multiple transfers, one smart contract

Question

I have the following function in my contract:

 function AcceptOffer() public payable
    {
        if ( msg.sender != InstanceOwner )
        {
            revert("You are not the owner of this contract and cannot accept the offer");
        }
        if (State != StateType.OfferPlaced) {
            revert("You can only accept valid offers");
        }
        InstanceOwner.transfer(Change)
        InstanceBuyer.transfer(OfferPrice);
        State = StateType.Accepted;
    }

But executing it gives a function payable error. If I remove one of the transfer lines, it works. Are multiple transfers in a single contract not possible? InstanceOwner and InstanceBuyer are two different addresses.

EDIT:

Change is calculated from the diff between AskingPrice and OfferPrice. So if AskingPrice is 5 and OfferPrice is 7 then Change is 2. When I debug the transaction, it shows the variables with their expected values. Therefore I expect the transfer to be successful. The line InstanceOwner.transfer(change) is acting like there's no balance in the variable but there is when I inspect it.

Answer 1

There is no issue with multiple transfers, you can do as many transfers as you want iff you supply enough gas. The following could be possible causes of error:

• Your contract must have sufficient balance (Change+OfferPrice) or your since your function is payable, you must send Change+offerPrice WEI to your contract while executing AcceptOffer function.
• You are sending sufficient gas, try increasing the gas
• If one of the InstanceOwner or InstanceBuyer is a contract address which does not accept Ether

Answer 2

Multiple transfers are very much 'possible' - but you are missing ; on the InstanceOwner.transfer(Change) line, which will throw a function payable error given that you are providing enough gas for the two transfers and state change.