2021-11-30 15:01:04[1638284464.0051] - new sell order: Array
(
    [contract] => DOT_USDT
    [price] => 38.4503
    [size] => -0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)

2021-11-30 18:01:03[1638295263.9572] - new sell order: Array
(
    [contract] => DOT_USDT
    [price] => 38.7942
    [size] => -0
    [tif] => gtc
)
 Array
(
    [label] => INVALID_ARGUMENT
    [detail] => invalid size
)