error Error: call revert exception; VM Exception while processing transaction: reverted with reason string "ds-math-sub-underflow" [ See: https://links.ethers.org/v5-errors-CALL_EXCEPTION ] (method="getAmountsIn(uint256,address[])", data="0x08c379a00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000001564732d6d6174682d7375622d756e646572666c6f770000000000000000000000", errorArgs=["ds-math-sub-underflow"], errorName="Error", errorSignature="Error(string)", reason="ds-math-sub-underflow", code=CALL_EXCEPTION, version=abi/5.7.0)

原因是什么 如何解决