Please complete transaction first

When I try to Buy/Sell (futures), I’m getting a message :{“code”:-2019,“msg”:“Margin is insufficient.”}. Once I open the margin webpage on the top corner a warning message appear “Please complete the transfer transaction in your cross margin first”. But I cant find any transaction to complete. Could you please clarify?
Thank you

The mentioned error is shown when the account does not hold the available funds to open the requested position. Confirm you the available funds before placing the order.

Can you please advise how to complete this? I have running trough my entire account details and transactions and didn’t find anything to complete.

Please contact Binance Customer Support for account related issues.