Supply in the pool and sends WETH contract Aave error

This contract is calling supply as if the tokens are stored on the contract itself, not msg.sender. To supply on the users behalf you will need the user to call approve on WETH, passing your contract as spender and call transferFrom inside of your supply function.

Before calling supply you must approve the pool to spend these tokens by calling the approve function on the underlying token (i.e. on the USDC contract if you are supplying USDC), passing the poolAddress as the spender parameter

You can either send the tokens to your contract first, or have the user approve your contract to spend their tokens and call transferFrom to send funds from the user to your contract inside of submitOrder;