Exiting Cover Orders in Node JS Library

I am using node js library, I am placing a cover order and receiving the order_id as well when i place it and I am using the same order_id to exit the Cover Order. When I try to exit I am getting the below error, Please some one help in this regard.

error {
0|index | status: 'error',
0|index | message: 'Order cannot be cancelled as it is being processed. Try later.',
0|index | data: null,
0|index | error_type: 'InputException'
0|index | }