Sending STX from Stacks Wallet (with Ledger) to Binance

I have been unable to send STX to Binance. The error message reads as follows:
“The Stacks Blockchain API you’re connected to returned a HTTP error code, preventing this transaction form broadcasting”.
Made 4 attempts with same response.

3 transfers from the Stacks wallet (using Ledger) to Binance on 4th May and 4th June 2021 were successful. These were the only send transaction I had performed since opening the Stacks Wallet.

If my Stacks wallet needs upgrading step by step instruction will be appreciated.

Can anyone please help. I am a crypto novice.