Why does the prompt "Insufficient funds" appear when placing an order and how to solve it?

Prompt when opening a position: The margin required for your order exceeds the available balance. You can reduce the margin occupation by adjusting the leverage multiple, transfer funds to increase the account balance, or reduce the opening quantity and then open the position.

 

Prompt of insufficient closable quantity for one-way position closing: One position corresponds to only one closing order. You currently have an order that can close the position, and placing another order will prompt insufficient funds. You can first cancel the original order and then place a new one.