Hi AndrewAMD, finally the scripts tries to open another position and I receive the same error, with the .diag file available. Attached, there is the warning message in the Zorro window. As described earlier, the position is indeed opened in the Tradier live account, but Zorro does not reflect it and prints this warning message.

It is a live account session, so I skip the line with the API code:

HTTP: 520 recvd 1 (30.7400 462.440800 ms) 163
HandleTrades 16:53:00
Handle: 833b020 0 tick
TradeValue 16:53:00
Account 16:53:00
BrokerAccount:
HTTP: https://api.tradier.com/v1/accounts/6YA15991/balances,(null),Accept: application/json

Do you see anything wrong with the plugin ? Do you think the Tradier API has been updated and the plugin no longer works ?
Many thanks for your support.

Attached Files Window.JPG