I asked for help and didn't know what the problem was for half a day.

create_order is a custom subscript function, and I've used this function many times without any problems, without any problems, without any errors. But once you put it on the Wex analogue disc, it will only make a mistake when you sell it.

I logged the number of orders before I called the order function, and it says normal, and the account also has coins.

But if you just type in, type in, type in, the number of bits, the number of bits, it becomes zero, and it returns an error.

This is the code when you ordered.

This is an error message, and you can see that the printing of the next order is normal.

In case I also paste the code for the custom function...